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Eckermannite

A valid IMA mineral species

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Eckermannite

Hpakant-Tawmaw Jade Tract, Hpakant Township, Mohnyin District, Kachin State, Myanmar

Eckermannite

Hpakant-Tawmaw Jade Tract, Hpakant Township, Mohnyin District, Kachin State, Myanmar

Eckermannite

Hpakant-Tawmaw Jade Tract, Hpakant Township, Mohnyin District, Kachin State, Myanmar

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About EckermanniteHide

Harry von Eckermann

Formula:

NaNa₂(Mg₄Al}Si₈O₂₂(OH)₂

The eckermannite group minerals are sodium amphiboles defined with ^A(Na+K+2Ca)> 0.5 apfu and 0.5 apfu < ^C(Al+Fe³⁺+2Ti) < 1.5 apfu with Al as the dominant element

Eckermannite is defined with

A position: Na dominant
C²⁺ position: Mg dominant
C³⁺ position: Al dominant
W position: (OH) dominant

Lustre:

Vitreous

Hardness:

5 - 6

Specific Gravity:

3.02 (Calculated)

Crystal System:

Monoclinic

Member of:

Eckermannite Root Name Group > Sodium Amphibole Subgroup > w(OH,F,Cl)-dominant Amphibole Group > Amphibole Supergroup

Name:

For (Claes Walter) Harry von Eckermann (5 November 1886, Stockholm, Sweden - 20 May 1969, Rönö, Sweden), industrialist, mineralogist and petrologist.

Type Locality:

ⓘ Hpakant-Tawmaw Jade Tract, Hpakant Township (Hpakan; Phakant; Phakan), Mohnyin District, Kachin State, Myanmar

Name first introduced for an amphibole from Norra Kärr, Sweden by Adamson (1942).
Redefined IMA in 2014 (IMA2013-136), according to the new IMA-approved nomenclature of amphiboles published in 2012 (Hawthorne et al., 2012).

NOTE: In the characterization of the holotype of eckermannite from Norra Kärr (Adamson, 1942), Li was not recognized (cf. Sundius 1945). Re-examination of the holotype material and of the original sample analyzed by Törnebohm (1906) confirmed that they both are actually fluoro-leakeite (Oberti et al. 2015). A new holotype for eckermannite, from the Jade Mine Tract, Myanmar, was designated by Oberti et al. (2015).

NOTE: All localities listed here under "eckermannite" should be checked if they are to be assigned to eckermannite according to the redefinition.

Eckermannite is to be expected in metabasites in the post-glaucophane high-P regime (Howe et al., 2018).

Unique IdentifiersHide

Mindat ID:

1348

Long-form identifier:

mindat:1:1:1348:8

IMA Classification of EckermanniteHide

IMA status:

Approved

IMA status notes:

Renamed by the IMA

IMA Formula:

NaNa₂(Mg₄Al)Si₈O₂₂(OH)₂

Approval year:

2013

First published:

1942

Approval history:

Renamed by IMA: 2014

Type description reference:

Adamson, Olge J. (1942) Eckermannite, a new alkali amphibole. Geologiska Föreningen i Stockholm Förhandlingar, 64 (3) 329-334 doi:10.1080/11035894209446082

Classification of EckermanniteHide

Strunz-mindat (2026):

9.DE.25

9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si₄O₁₁; Clinoamphiboles

Dana 8th ed.:

66.1.3c.6

66 : INOSILICATES Double-Width,Unbranched Chains,(W=2)
1 : Amphiboles - Mg-Fe-Mn-Li subgroup

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Symbol	Source	Reference for Standard
Eck	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
Eck	Kretz (1983)	Kretz, R. (1983) Symbols of rock-forming minerals. American Mineralogist, 68, 277–279.
Eck	Siivolam & Schmid (2007)	Siivolam, J. and Schmid, R. (2007) Recommendations by the IUGS Subcommission on the Systematics of Metamorphic Rocks: List of mineral abbreviations. Web-version 01.02.07. IUGS Commission on the Systematics in Petrology. download
Eck	Whitney & Evans (2010)	Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371
Eck	The Canadian Mineralogist (2019)	The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Pronunciation of EckermanniteHide

Pronunciation:

Play	Recorded by	Country
	Jolyon Ralph	United Kingdom

Physical Properties of EckermanniteHide

Lustre:

Vitreous

Hardness:

5 - 6 on Mohs scale

Density:

3.02 g/cm³ (Calculated)

Optical Data of EckermanniteHide

Type:

Biaxial (-)

RI values:

n_α = 1.605 n_β = 1.630 n_γ = 1.634

Max. Birefringence:

δ = 0.029
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Thickness: 30 µm Order divisions

Rotation:

Surface Relief:

High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.

Focus:

In focus

Interference Figure:

This shows the idealized biaxial acute bisectrix (Bxa) interference figure - the conoscopic view for a grain cut perpendicular to the acute bisectrix, using this mineral's 2V. The two small white dots mark the melatopes - the points where the two optic axes emerge - and are shown only when they fall within the field of view. The coloured bands are isochromatics, and the dark bands are isogyres.

Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.

No measured or calculated 2V is on file for this mineral, so the value used here (43°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.

Thickness: 30 µm

Stage rotation: 0°

Dispersion:

r < v moderate

Chemistry of EckermanniteHide

Mindat Formula:

NaNa₂(Mg₄Al}Si₈O₂₂(OH)₂

The eckermannite group minerals are sodium amphiboles defined with ^A(Na+K+2Ca)> 0.5 apfu and 0.5 apfu < ^C(Al+Fe³⁺+2Ti) < 1.5 apfu with Al as the dominant element

Eckermannite is defined with

A position: Na dominant
C²⁺ position: Mg dominant
C³⁺ position: Al dominant
W position: (OH) dominant

Element Weights:

Element	% weight
O	47.768 %
Si	27.951 %
Mg	12.094 %
Na	8.580 %
Al	3.357 %
H	0.251 %

Calculated from ideal end-member formula.

Elements listed:

Al, H, Mg, Na, O, Si - search for minerals with similar chemistry

Crystallography of EckermanniteHide

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Space Group:

B2/m

Setting:

C2/m

Cell Parameters:

a = 9.8087(7) Å, b = 17.845(1) Å, c = 5.2905(4) Å
β = 103.660(1)°

Ratio:

a:b:c = 0.55 : 1 : 0.296

Unit Cell V:

899.8 Å³

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0020422	Eckermannite	Oberti R, Boiocchi M, Hawthorne F C, Ball N A, Harlow G E (2015) Eckermannite revised: The new holotype from the Jade Mine Tract, Myanmar-crystal structure, mineral data, and hints on the reasons for the rarity of eckermannite American Mineralogist 100 909-914		2015	Jade Mine Tract, Kachin Province, Myanmar	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Eckermannite'
loop_
_publ_author_name
'Oberti R'
'Boiocchi M'
'Hawthorne F C'
'Ball N A'
'Harlow G E'
_journal_name_full 'American Mineralogist'
_journal_volume 100 
_journal_year 2015
_journal_page_first 909
_journal_page_last 914
_publ_section_title
;
 Eckermannite revised: The new holotype from the Jade Mine Tract, Myanmar-crystal
 structure, mineral data, and hints on the reasons for the rarity of eckermannite
 Note: Sample AMNH H108401
;
_database_code_amcsd 0020422
_chemical_compound_source 'Jade Mine Tract, Kachin Province, Myanmar'
_chemical_formula_sum 'Na2.829 Ca.11 K.067 Mg3.884 Fe.486 Al.62 Mn.01 Si8 O23.97 F.03 H1.97'
_cell_length_a 9.8087
_cell_length_b 17.8448
_cell_length_c 5.2905
_cell_angle_alpha 90
_cell_angle_beta 103.6600
_cell_angle_gamma 90
_cell_volume 899.826
_exptl_crystal_density_diffrn      3.032
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,z'
  '1/2+x,1/2-y,z'
  '-x,y,-z'
  '1/2-x,1/2+y,-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Na1   0.00000   0.27541   0.50000   0.94500   0.01920
Ca1   0.00000   0.27541   0.50000   0.05500   0.01920
Na2   0.00000   0.50000   0.00000   0.28900   0.02070
K2   0.00000   0.50000   0.00000   0.02100   0.02070
Na3   0.02590   0.50000   0.07170   0.11800   0.03810
K3   0.02590   0.50000   0.07170   0.00900   0.03810
Na4   0.00000   0.47330   0.00000   0.20700   0.03920
K4   0.00000   0.47330   0.00000   0.01400   0.03920
Mg1   0.00000   0.09002   0.50000   0.95000   0.01020
Fe1   0.00000   0.09002   0.50000   0.05000   0.01020
Mg2   0.00000   0.18130   0.00000   0.51200   0.01030
Al1   0.00000   0.18130   0.00000   0.31000   0.01030
Fe2   0.00000   0.18130   0.00000   0.17800   0.01030
Mg3   0.00000   0.00000   0.00000   0.96000   0.00980
Fe3   0.00000   0.00000   0.00000   0.03000   0.00980
Mn3   0.00000   0.00000   0.00000   0.01000   0.00980
Si1   0.27930   0.08630   0.29240   1.00000   0.00850
Si2   0.28706   0.17250   0.80083   1.00000   0.00930
O1   0.11100   0.08805   0.21287   1.00000   0.01080
O2   0.11802   0.16990   0.73412   1.00000   0.01180
O3   0.10828   0.00000   0.70978   0.98500   0.01340
F3   0.10828   0.00000   0.70978   0.01500   0.01340
O4   0.36274   0.25079   0.79757   1.00000   0.01470
O5   0.34970   0.12893   0.08338   1.00000   0.01300
O6   0.34156   0.11827   0.58486   1.00000   0.01380
O7   0.33725   0.00000   0.28952   1.00000   0.01460
H1   0.20360   0.00000   0.74040   0.98500   0.01300
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Na1 0.02110 0.01710 0.02170 0.00000 0.00990 0.00000
Ca1 0.02110 0.01710 0.02170 0.00000 0.00990 0.00000
Na2 0.00980 0.03000 0.02760 0.00000 0.01500 0.00000
K2 0.00980 0.03000 0.02760 0.00000 0.01500 0.00000
Na3 0.03700 0.04160 0.03280 0.00000 0.00260 0.00000
K3 0.03700 0.04160 0.03280 0.00000 0.00260 0.00000
Na4 0.03940 0.01390 0.07690 0.00000 0.03800 0.00000
K4 0.03940 0.01390 0.07690 0.00000 0.03800 0.00000
Mg1 0.01070 0.01080 0.00880 0.00000 0.00190 0.00000
Fe1 0.01070 0.01080 0.00880 0.00000 0.00190 0.00000
Mg2 0.00970 0.01130 0.00960 0.00000 0.00180 0.00000
Al1 0.00970 0.01130 0.00960 0.00000 0.00180 0.00000
Fe2 0.00970 0.01130 0.00960 0.00000 0.00180 0.00000
Mg3 0.01100 0.00980 0.00780 0.00000 0.00100 0.00000
Fe3 0.01100 0.00980 0.00780 0.00000 0.00100 0.00000
Mn3 0.01100 0.00980 0.00780 0.00000 0.00100 0.00000
Si1 0.00830 0.00940 0.00740 -0.00030 0.00090 -0.00020
Si2 0.00980 0.00980 0.00800 -0.00110 0.00160 0.00010
O1 0.00890 0.01320 0.01020 -0.00130 0.00220 -0.00190
O2 0.01100 0.01180 0.01100 0.00000 -0.00100 -0.00050
O3 0.01160 0.01440 0.01350 0.00000 0.00170 0.00000
F3 0.01160 0.01440 0.01350 0.00000 0.00170 0.00000
O4 0.01970 0.01130 0.01370 -0.00410 0.00520 0.00020
O5 0.00970 0.01810 0.01050 -0.00060 0.00080 0.00380
O6 0.01250 0.01820 0.00980 0.00030 0.00090 -0.00340
O7 0.01380 0.01060 0.01900 0.00000 0.00320 0.00000

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
2.702 Å	(100)
3.395 Å	(59)
3.128 Å	(56)
2.525 Å	(56)
8.407 Å	(42)
2.574 Å	(36)
3.257 Å	(34)
2.161 Å	(33)
2.966 Å	(33)
4.460 Å	(30)

Comments:

From Oberti et al. (2015)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 3b: Earth’s earliest hydrosphere	>4.45
17 : Marine authigenic Hadean minerals (see also #24)
Stage 4b: Highly evolved igneous rocks	>3.0
35 : Ultra-alkali and agpaitic igneous rocks
36 : Carbonatites, kimberlites, and related igneous rocks

Type Occurrence of EckermanniteHide

Type Locality:

ⓘ Hpakant-Tawmaw Jade Tract, Hpakant Township (Hpakan; Phakant; Phakan), Mohnyin District, Kachin State, Myanmar

Place of Conservation of Type Material:

In the collections of the Department of Earth and Planetary Sciences, American Museum of Natural History, New York, NY, USA, specimen number AMNH H108401

Reference:

Adamson, Olge J. (1942) Eckermannite, a new alkali amphibole. Geologiska Föreningen i Stockholm Förhandlingar, 64 (3) 329-334 doi:10.1080/11035894209446082

Synonyms of EckermanniteHide

IMA2013-136

Other Language Names for EckermanniteHide

Dutch:Eckermanniet

German:Eckermannit

Russian:Экерманнит

Simplified Chinese:氟镁钠闪石
镁铝钠闪石

Spanish:Eckermannita

Traditional Chinese:氟鎂鈉閃石
鎂鋁鈉閃石

Relationship of Eckermannite to other SpeciesHide

Member of:

Eckermannite Root Name Group > Sodium Amphibole Subgroup > w(OH,F,Cl)-dominant Amphibole Group > Amphibole Supergroup

Other Members of Eckermannite Root Name Group:

'Ferro-eckermannite'	NaNa₂(Fe²⁺₄Al)Si₈O₂₂(OH)₂	Mon.
Mangani-eckermannite	NaNa₂(Mg₄Mn³⁺)Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
Mangano-ferri-eckermannite	NaNa₂(Mn²⁺₄Fe³⁺)Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
Scandio-fluoro-eckermannite	NaNa₂(Mg₄Sc)(Si₈O₂₂)F₂	Mon. 2/m : B2/m

Common AssociatesHide

Associations Based on Photo Data:

2 photos of Eckermannite associated with Arfvedsonite	NaNa₂(Fe²⁺₄Fe³⁺)Si₈O₂₂(OH)₂
2 photos of Eckermannite associated with Quartz	SiO₂
1 photo of Eckermannite associated with Aegirine	NaFe³⁺Si₂O₆
1 photo of Eckermannite associated with Richterite	Na(CaNa)Mg₅(Si₈O₂₂)(OH)₂
1 photo of Eckermannite associated with Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
1 photo of Eckermannite associated with Kosmochlor	NaCrSi₂O₆

Related Minerals - Strunz-mindat Grouping Hide

9.DE.	Shojiite	Na(NaMg)Mg₅Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.	Clino-suenoite	◻Mn²⁺₂(Mg₅)(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.	Mangani-eckermannite	NaNa₂(Mg₄Mn³⁺)Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.05	'Permanganogrunerite'	◻{Mn²⁺₂}{Mn²⁺₅}(Si₈O₂₂)(OH)₂	Mon.
9.DE.05	Cummingtonite	◻Mg₂Mg₅(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.05	Ferri-fluoro-leakeite	NaNa₂(Mg₂Fe³⁺₂Li)(Si₈O₂₂)F₂	Mon. 2/m : B2/m
9.DE.05	Grunerite	◻Fe²⁺₂Fe²⁺₅(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.05	Clino-holmquistite Root Name Group	◻Li₂(C²⁺₃C³⁺₂)(Si₈O₂₂)w₂	Mon.
9.DE.10	Actinolite	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.10	Fluoro-cannilloite	CaCa₂(Mg₄Al)(Si₅Al₃)O₂₂F₂	Mon. 2/m : B2/m
9.DE.10	Joesmithite	Pb²⁺Ca₂(Mg₃Fe³⁺₂)(Si₆Be₂)O₂₂(OH)₂	Mon. 2/m : P2/b
9.DE.10	Clino-ferro-suenoite	◻Mn²⁺₂(Fe²⁺₅)(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.10	Fluoro-tremolite	◻Ca₂Mg₅(Si₈O₂₂)F₂	Mon. 2/m : B2/m
9.DE.10	'Parvo-manganotremolite'	◻{CaMn²⁺}{Mg₅}(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.10	Magnesio-ferri-hornblende	◻Ca₂(Mg₄Fe³⁺)[(Si₇Al)O₂₂](OH)₂	Mon. 2/m : B2/m
9.DE.10	Ferro-ferri-hornblende	◻Ca₂(Fe²⁺₄Fe³⁺)(AlSi₇O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.10	'Ferro-cannilloite'	CaCa₂(Fe²⁺₄Al)(Si₅Al₃O₂₂)OH₂
9.DE.10	'Ferro-ferri-cannilloite'	CaCa₂(Fe²⁺₄Fe³⁺)(Si₅Al₃O₂₂)OH₂
9.DE.10	'Ferro-fluoro-actinolite'	◻{Ca₂}{Fe₅}(Si₈O₂₂)F₂
9.DE.10	'Ferro-fluoro-hornblende'	◻Ca₂(Fe²⁺₄Al)(AlSi₇O₂₂)F₂
9.DE.10	Magnesio-ferri-fluoro-hornblende	◻Ca₂(Mg₄Fe³⁺)(AlSi₇O₂₂)F₂	Mon. 2/m : B2/m
9.DE.10	'Ferro-ferri-fluoro-hornblende'	◻Ca₂(Fe²⁺₄Fe³⁺)(AlSi₇O₂₂)F₂
9.DE.10	'Ferri-fluoro-tschermakite'	◻{Ca₂}{Mg₃Fe³⁺₂}(Al₂Si₆O₂₂)F₂
9.DE.10	'Ferro-ferri-fluoro-tschermakite'	◻{Ca₂}{Fe²⁺₃Fe³⁺₂}(Al₂Si₆O₂₂)F₂
9.DE.10	'Ferro-fluoro-tschermakite'	◻{Ca₂}{Fe²⁺₃Al₂}(Al₂Si₆O₂₂)F₂
9.DE.10	'Fluoro-tschermakite'	◻{Ca₂}{Mg₃Al₂}(Al₂Si₆O₂₂)F₂
9.DE.10	'Magnesio-fluoro-hornblende'	◻Ca₂(Mg₄Al)(AlSi₇O₂₂)F₂
9.DE.10	Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.10	'Ferro-ferri-tschermakite'	◻{Ca₂}{Fe²⁺₃Fe³⁺₂}(Al₂Si₆O₂₂)(OH)₂	Mon.
9.DE.10	'Cannilloite'	CaCa₂(Mg₄Al)(Si₅Al₃O₂₂)OH₂	Mon.
9.DE.10	Tschermakite	◻Ca₂(Mg₃Al₂)(Al₂Si₆O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.10	Magnesio-hornblende	◻Ca₂(Mg₄Al)(Si₇Al)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.10	'Ferri-tschermakite'	◻Ca₂(Mg₃Fe³⁺₂)(Al₂Si₆O₂₂)(OH)₂	Mon.
9.DE.10	Ferro-actinolite	◻Ca₂Fe²⁺₅(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.10	Ferro-hornblende	◻Ca₂(Fe²⁺₄Al)(Si₇Al)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.10	Ferro-tschermakite	◻Ca₂(Fe²⁺₃Al₂)(Al₂Si₆O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.15	Potassic-chloro-pargasite	KCa₂(Mg₄Al)(Si₆Al₂)O₂₂Cl₂	Mon. 2/m : B2/m
9.DE.15	'Ferro-fluoro-pargasite'	(Na)(Ca₂)(Fe²⁺₄Al)(Al₂Si₆O₂₂)F₂
9.DE.15	'Potassic-ferro-chloro-edenite'	KCa₂Fe²⁺₅(AlSi₇O₂₂)Cl₂
9.DE.15	'Ferro-ferri-sadanagaite'	NaCa₂(Fe²⁺₃Fe³⁺₂)(Al₃Si₅O₂₂)(OH)₂	Mon.
9.DE.15	Hastingsite	NaCa₂(Fe²⁺₄Fe³⁺)(Si₆Al₂)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.15	Fluoro-edenite	NaCa₂Mg₅(Si₇Al)O₂₂F₂	Mon. 2/m : P2/m
9.DE.15	Pargasite	NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.15	Magnesio-fluoro-hastingsite	NaCa₂(Mg₄Fe³⁺)(Si₆Al₂)O₂₂F₂	Mon. 2/m : B2/m
9.DE.15	Potassic-fluoro-hastingsite	KCa₂(Fe²⁺₄Fe³⁺)(Si₆Al₂)O₂₂F₂	Mon. 2/m : B2/m
9.DE.15	Potassic-chloro-hastingsite	KCa₂(Fe²⁺₄Fe³⁺)(Si₆Al₂)O₂₂Cl₂	Mon. 2/m : B2/m
9.DE.15	'Unnamed (F-dominant analogue of Ferri-kaersutite)'	(Na,K)Ca₂[Mg₃(Fe³⁺,Fe²⁺)Ti](Si₆Al₂O₂₂)(F,O)₂	Mon. 2/m : B2/m
9.DE.15	Edenite	NaCa₂Mg₅(Si₇Al)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.15	Potassic-sadanagaite	KCa₂(Mg₃Al₂)(Al₃Si₅O₂₂)(OH)₂	Mon. 2
9.DE.15	Ferri-kaersutite	NaCa₂(Mg₃Fe³⁺Ti)(Si₆Al₂O₂₂)O₂	Mon. 2/m : B2/m
9.DE.15	Potassic-pargasite	KCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.15	Potassic-ferro-sadanagaite	KCa₂(Fe²⁺₃Al₂)(Al₃Si₅O₂₂)(OH)₂	Mon.
9.DE.15	Kaersutite	NaCa₂(Mg₃AlTi⁴⁺)(Si₆Al₂)O₂₂O₂	Mon. 2/m : B2/m
9.DE.15	'Ferro-chloro-pargasite'	NaCa₂(Fe²⁺₄Al)(Al₂Si₆O₂₂)Cl₂
9.DE.15	Potassic-fluoro-pargasite	KCa₂(Mg₄Al)(Si₆Al₂)O₂₂F₂	Mon. 2/m : B2/m
9.DE.15	Potassic-ferro-ferri-sadanagaite	KCa₂(Fe²⁺₃Fe³⁺₂)(Al₃Si₅O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.15	Fluoro-pargasite	NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂F₂	Mon. 2/m : B2/m
9.DE.15	'Parvo-mangano-edenite'	{Na}{CaMn²⁺}{Mg₅}(AlSi₇O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.15	Ferro-fluoro-edenite	NaCa₂Fe²⁺₅(AlSi₇O₂₂)F₂	Mon. 2/m : B2/m
9.DE.15	Mangani-pargasite	NaCa₂(Mg₄Mn³⁺)(Si₆Al₂)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.15	Sadanagaite	NaCa₂(Mg₃Al₂)(Si₅Al₃O₂₂)(OH)₂	Mon.
9.DE.15	Magnesio-hastingsite	NaCa₂(Mg₄Fe³⁺)(Si₆Al₂)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.15	'Ferri-sadanagaite'	NaCa₂(Mg₃Fe³⁺₂)(Al₃Si₅O₂₂)(OH)₂
9.DE.15	'Ferro-sadanagaite'	NaCa₂(Fe₃Al₂)(Al₃Si₅O₂₂)(OH)₂
9.DE.15	'Ferri-fluoro-sadanagaite'	{Na}{Ca₂}{Mg₃Fe³⁺₂}(Al₃Si₅O₂₂)F₂
9.DE.15	'Ferro-ferri-fluoro-sadanagaite'	{Na}{Ca₂}{Fe²⁺₃Fe³⁺₂}(Al₃Si₅O₂₂)F₂
9.DE.15	'Ferro-fluoro-sadanagaite'	{Na}{Ca₂}{Fe²⁺₃Al₂}(Al₃Si₅O₂₂)F₂
9.DE.15	'Fluoro-sadanagaite'	{Na}{Ca₂}{Mg₃Al₂}(Al₃Si₅O₂₂)F₂
9.DE.15	'Potassic-chloro-sadanagaite'	KCa₂(Mg₃Al₂)(Al₃Si₅O₂₂)Cl₂
9.DE.15	'Potassic-ferro-chloro-sadanagaite'	KCa₂(Fe²⁺₃Al₂)(Al₃Si₅O₂₂)Cl₂
9.DE.15	Ferro-edenite	NaCa₂Fe²⁺₅(Si₇Al)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.15	Oxo-magnesio-hastingsite	NaCa₂(Mg₃(Fe³⁺_2-x,Ti_x))₅(Si₆Al₂O₂₂)O₂	Mon. 2/m : B2/m
9.DE.15	Potassic-ferro-pargasite	KCa₂(Fe²⁺₄Al)(Si₆Al₂)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.15	Potassic-hastingsite	KCa₂(Fe²⁺₄Fe³⁺)(Al₂Si₆O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.15	'Fluoro-hastingsite'	NaCa₂(Fe²⁺₄Fe³⁺)(Al₂Si₆O₂₂)F₂
9.DE.15	Potassic-magnesio-hastingsite	KCa₂(Mg₄Fe³⁺)(Si₆Al₂)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.15	Vanadio-pargasite	NaCa₂(Mg³⁺₄V)(Al₂Si₆)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.15	'Ferro-kaersutite'	NaCa₂(Fe²⁺₃AlTi)(Si₆Al₂O₂₂)O₂	Mon.
9.DE.15	Chromio-pargasite	NaCa₂(Mg₄Cr)(Si₆Al₂)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.15	Ferro-pargasite	NaCa₂(Fe²⁺₄Al)(Si₆Al₂)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.20	'Ghoseite'	◻[Mn²⁺Na][Mg₄Al]Si₈O₂₂(OH)₂
9.DE.20	Potassic-ferro-taramite	K(CaNa)(Fe²⁺₃Al₂)(Si₆Al₂)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.20	Ferri-fluoro-katophorite	Na(CaNa)(Mg₄Fe³⁺)(AlSi₇O₂₂)F₂	Mon. 2/m : B2/m
9.DE.20	Barroisite	◻(CaNa)(Mg₃Al₂)(AlSi₇O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	Fluoro-richterite	Na(CaNa)Mg₅(Si₈O₂₂)F₂	Mon. 2/m : B2/m
9.DE.20	Potassic-ferro-ferri-taramite	K(CaNa)(Fe²⁺₃Fe³⁺₂)(Al₂Si₆O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	'Potassic-ferri-katophorite'	K(CaNa)(Mg₄Fe³⁺)(AlSi₇O₂₂)(OH)₂
9.DE.20	'Potassic-ferro-richterite'	K(CaNa)Fe²⁺₅(Si₈O₂₂)(OH)₂
9.DE.20	Potassic-fluoro-richterite	K(CaNa)Mg₅(Si₈O₂₂)F₂	Mon. 2/m : B2/m
9.DE.20	Potassic-richterite	K(CaNa)Mg₅(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	Ferri-ghoseite	◻(Mn²⁺Na)(Mg₄Fe³⁺)Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.20	Fluoro-taramite	Na(CaNa)(Mg₃Al₂)(Al₂Si₆O₂₂)F₂	Mon. 2/m : B2/m
9.DE.20	'Ferro-ferri-fluoro-katophorite'	Na(CaNa)(Fe²⁺₄Fe³⁺)(AlSi₇O₂₂)F₂	Mon.
9.DE.20	Richterite	Na(CaNa)Mg₅(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	Ferri-winchite	◻(NaCa)(Mg₄Fe³⁺)Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.20	'Fluoro-katophorite'	Na(CaNa)(Mg₄Al)(AlSi₇O₂₂)F₂	Mon.
9.DE.20	Hjalmarite	Na(NaMn)Mg₅(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	Ferro-taramite	Na(CaNa)(Fe²⁺₃Al₂)(Al₂Si₆O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	'Clinoferroholmquistite'	◻Li₂[Fe²⁺₃Al₂]Si₈O₂₂(OH,F)₂
9.DE.20	Ferro-katophorite	Na(CaNa)(Fe²⁺₄Al)(AlSi₇O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	Taramite	Na(CaNa)(Mg₃Al₂)(Al₂Si₆O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	'Potassic-fluoro-katophorite'	K(CaNa)(Mg₄Al)(AlSi₇O₂₂)F₂
9.DE.20	'Ferro-fluoro-katophorite'	Na(CaNa)(Fe²⁺₄Al)(AlSi₇O₂₂)F₂
9.DE.20	Ferri-katophorite	Na(CaNa)(Mg₄Fe³⁺)(AlSi₇O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	'Ferro-ferri-barroisite'	◻(CaNa)(Fe²⁺₃Fe³⁺₂)(AlSi₇O₂₂)(OH)₂
9.DE.20	Ferri-taramite	Na(CaNa)(Mg₃Fe³⁺₂)(Al₂Si₆O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	'Potassic-ferro-ferri-katophorite'	K(CaNa)(Fe²⁺₄Fe³⁺)(AlSi₇O₂₂)(OH)₂
9.DE.20	'Ferro-ferri-winchite'	◻(CaNa)(Fe²⁺₄Fe³⁺)Si₈O₂₂(OH)₂
9.DE.20	Winchite	◻(CaNa)(Mg₄Al)(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	'Ferro-fluoro-richterite'	{Na}{CaNa}{Fe²⁺₅}(Si₈O₂₂)F₂
9.DE.20	'Fluoro-winchite'	◻(CaNa)(Mg₄Al)(Si₈O₂₂)F₂
9.DE.20	'Ferro-fluoro-winchite'	◻{CaNa}{Fe²⁺₄Al}(Si₈O₂₂)F₂
9.DE.20	'Ferri-barroisite'	◻(CaNa)(Mg₃Fe³⁺₂)(AlSi₇O₂₂)(OH)₂
9.DE.20	'Ferro-ferri-taramite'	Na(CaNa)(Fe²⁺₃Fe³⁺₂)(Al₂Si₆O₂₂)(OH)₂
9.DE.20	'Ferri-fluoro-barroisite'	◻{CaNa}{Mg₃Fe³⁺₂}(AlSi₇O₂₂)F₂
9.DE.20	'Ferro-fluoro-barroisite'	◻{CaNa}{Fe²⁺₃Al₂}(AlSi₇O₂₂)F₂
9.DE.20	'Ferro-ferri-fluoro-barroisite'	◻{CaNa}{Fe²⁺₃Fe³⁺₂}(AlSi₇O₂₂)F₂
9.DE.20	'Fluoro-barroisite'	◻{CaNa}{Mg₃Al₂}(AlSi₇O₂₂)F₂
9.DE.20	Ferro-ferri-katophorite	Na(NaCa)(Fe²⁺₄Fe³⁺)(Si₇Al)O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.20	'Ferri-fluoro-taramite'	Na(CaNa)(Mg₃Fe³⁺₂)(Al₂Si₆O₂₂)F₂
9.DE.20	'Ferro-ferri-fluoro-taramite'	Na(CaNa)(Fe²⁺₃Fe³⁺₂)(Al₂Si₆O₂₂)F₂
9.DE.20	'Ferro-fluoro-taramite'	Na(CaNa)(Fe²⁺₃Al₂)(Al₂Si₆O₂₂)F₂
9.DE.20	'Potassic-ferri-taramite'	K(CaNa)(Mg₃Fe³⁺₂)(Al₂Si₆O₂₂)(OH)₂
9.DE.20	'Magnesiotaramite'	{Na}{CaNa}{Mg₃AlFe³⁺}(Al₂Si₆O₂₂)(OH)₂	Mon.
9.DE.20	'Ferro-barroisite'	◻(CaNa)(Fe²⁺₃Al₂)(AlSi₇O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	Scandio-winchite	◻(NaCa)(Mg₄Sc)(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	Ferro-richterite	Na(CaNa)Fe²⁺₅(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	Katophorite	Na(CaNa){Mg₄Al)(AlSi₇O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.20	'Ferro-winchite'	◻(CaNa)(Fe²⁺₄Al)(Si₈O₂₂)(OH)₂	Mon.
9.DE.25	'Clino-sodic-fluoro-holmquistite'	{Na}{Li₂}{Mg₄Al}(Si₈O₂₂)F₂
9.DE.25	Ferro-ferri-nybøite	NaNa₂(Fe²⁺₃,Mg)Fe³⁺₂)(AlSi₇O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.25	Clino-ferro-ferri-holmquistite	◻Li₂(Fe²⁺₃Fe³⁺₂)(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.25	'Oxo-pargasite'	NaCa₂(Mg₃(Al_2-xTi_x))₅(Si₆Al₂O₂₂)O₂
9.DE.25	'Ferri-nybøite'	NaNa₂(Mg₃Fe³⁺₂)(AlSi₇O₂₂)(OH)₂	Mon.
9.DE.25	'Ferro-ferri-leakeite'	NaNa₂(Fe²⁺₂Fe³⁺₂Li)Si₈O₂₂(OH)₂	Mon.
9.DE.25	Ferro-ferri-fluoro-leakeite	NaNa₂(Fe²⁺₂Fe³⁺₂Li)(Si₈O₂₂)F₂	Mon. 2/m : B2/m
9.DE.25	Ferri-leakeite	NaNa₂(Mg₂Fe³⁺₂Li)Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.25	Fluoro-pedrizite	NaLi₂(Mg₂Al₂Li)(Si₈O₂₂)F₂	Mon. 2/m : B2/m
9.DE.25	Arfvedsonite	NaNa₂(Fe²⁺₄Fe³⁺)Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.25	'Mangano-ferri-fluoro-leakeite'	NaNa₂(Mn²⁺₂Fe³⁺₂Li)(Si₈O₂₂)F₂	Mon.
9.DE.25	Ferri-obertiite	NaNa₂(Mg₃Fe³⁺Ti)Si₈O₂₂O₂	Mon. 2/m : B2/m
9.DE.25	Riebeckite	◻Na₂(Fe²⁺₃Fe³⁺₂)Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.25	'Unnamed (Possible K-analogue of Ferri-obertiite)'	KNa₂((Mg,Fe,Na)₃Fe³⁺(Ti,Fe))Si₈O₂₂(O,F)₂
9.DE.25	Magnesio-fluoro-arfvedsonite	NaNa₂(Mg₄Fe³⁺)[Si₈O₂₂]F₂	Mon. 2/m : B2/m
9.DE.25	'Ferro-fluoro-glaucophane'	◻[Na₂][Fe²⁺₃Al₂]Si₈O₂₂F₂
9.DE.25	Oxo-mangani-leakeite	NaNa₂(Mn³⁺₄Li)Si₈O₂₂O₂	Mon. 2/m : B2/m
9.DE.25	Fluoro-leakeite	NaNa₂(Mg₂Al₂Li)(Si₈O₂₂)F₂	Mon. 2/m : B2/m
9.DE.25	Nybøite	NaNa₂(Mg₃Al₂)(AlSi₇O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.25	'Sodic-ferri-clinoferroholmquistite'	Na_0.5{Li₂}{Fe²⁺₃Fe³⁺₂}(Si₈O₂₂)(OH)₂	Mon.
9.DE.25	Potassic-arfvedsonite	KNa₂(Fe²⁺₄Fe³⁺)(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.25	'Potassic-mangano-mangani-ungarettiite'	KNa₂(Mn²⁺₂Mn³⁺₃)Si₈O₂₂O₂
9.DE.25	Potassic-jeanlouisite	K(NaCa)(Mg₄Ti)Si₈O₂₂O₂	Mon. 2/m : B2/m
9.DE.25	Ferri-pedrizite	NaLi₂(Mg₂Fe³⁺₂Li)Si₈O₂₂(OH)₂	Mon.
9.DE.25	Glaucophane	◻Na₂(Mg₃Al₂)Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.25	Ferro-fluoro-pedrizite	NaLi₂(Fe²⁺₂Al₂Li)[Si₈O₂₂]F₂	Mon. 2/m : B2/m
9.DE.25	Potassic-ferri-leakeite	KNa₂(Mg₂Fe³⁺₂Li)(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.25	Potassic-magnesio-fluoro-arfvedsonite	KNa₂(Mg₄Fe³⁺)(Si₈O₂₂)F₂	Mon. 2/m : B2/m
9.DE.25	Mangani-obertiite	NaNa₂(Mg₃Mn³⁺Ti⁴⁺)Si₈O₂₂O₂	Mon. 2/m : B2/m
9.DE.25	Scandio-fluoro-eckermannite	NaNa₂(Mg₄Sc)(Si₈O₂₂)F₂	Mon. 2/m : B2/m
9.DE.25	'Ferro-eckermannite'	NaNa₂(Fe²⁺₄Al)Si₈O₂₂(OH)₂	Mon.
9.DE.25	Ferro-ferri-pedrizite	NaLi₂(Fe²⁺₂Fe³⁺₂Li)Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.25	'Pedrizite'	NaLi₂(LiMg₂Al₂)(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.25	Ferro-pedrizite	NaLi₂(Fe²⁺₂Al₂Li)Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.25	Potassic-mangani-leakeite	KNa₂(Mg₂Mn³⁺₂Li)(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.25	'Clino-fluoro-holmquistite'	◻{Li₂}{Mg₃Al₂}(Si₈O₂₂)F₂
9.DE.25	Ferro-ferri-obertiite	NaNa₂(Fe²⁺₃Fe³⁺Ti)Si₈O₂₂O₂	Mon. 2/m : B2/m
9.DE.25	Magnesio-riebeckite	◻Na₂(Mg₃Fe³⁺₂)(Si₈O₂₂)(OH)₂	Mon.
9.DE.25	Potassic-magnesio-arfvedsonite	KNa₂(Mg₄Fe³⁺)(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.25	Fluoro-nybøite	NaNa₂(Mg₃Al₂)(AlSi₇O₂₂)(F,OH)₂	Mon. 2/m : B2/m
9.DE.25	Mangano-ferri-eckermannite	NaNa₂(Mn²⁺₄Fe³⁺)Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.25	'Fluoro-glaucophane'	◻[Na₂][Mg₃Al₂]Si₈O₂₂F₂
9.DE.25	Fluoro-riebeckite	◻Na₂(Fe²⁺₃Fe³⁺₂)(Si₈O₂₂)F₂	Mon. 2/m : B2/m
9.DE.25	Magnesio-fluoro-riebeckite	◻Na₂(Mg₃Fe³⁺₂)(Si₈O₂₂)F₂	Mon. 2/m : B2/m
9.DE.25	'Fluoro-eckermannite'	NaNa₂(Mg₄Al}Si₈O₂₂F₂
9.DE.25	'Ferro-fluoro-eckermannite'	NaNa₂(Fe²⁺₄Al}Si₈O₂₂F₂
9.DE.25	'Fluoro-arfvedsonite'	NaNa₂(Fe²⁺₄Fe³⁺)Si₈O₂₂F₂
9.DE.25	Magnesio-arfvedsonite	NaNa₂(Mg₄Fe³⁺)(Si₈O₂₂)(OH)₂	Mon. 2/m : B2/m
9.DE.25	'Ferri-fluoro-nybøite'	NaNa₂(Mg₃Fe³⁺₂)(AlSi₇O₂₂)F₂
9.DE.25	'Ferro-ferri-fluoro-nybøite'	NaNa₂(Fe²⁺₃Fe³⁺₂)(AlSi₇O₂₂)F₂
9.DE.25	Ferro-glaucophane	◻Na₂(Fe²⁺₃Al₂)Si₈O₂₂(OH)₂	Mon. 2/m : B2/m
9.DE.25	'Ferro-fluoro-nybøite'	NaNa₂(Fe²⁺₃Al₂)(AlSi₇O₂₂)F₂
9.DE.25	Mangani-dellaventuraite	NaNa₂(MgMn³⁺₂Ti⁴⁺Li)Si₈O₂₂O₂	Mon. 2/m : B2/m
9.DE.25	'Ferro-leakeite'	NaNa₂(Fe²⁺₂Al₂Li)(Si₈O₂₂)(OH)₂
9.DE.25	'Leakeite'	NaNa₂(Mg₂Al₂Li)(Si₈O₂₂)(OH)₂
9.DE.25	'Potassic-leakeite'	KNa₂(Mg₂Al₂Li)(Si₈O₂₂)(OH)₂
9.DE.25	'Ferri-fluoro-pedrizite'	NaLi₂(LiMg₂Fe³⁺₂)(Si₈O₂₂)F₂
9.DE.25	'Ferro-ferri-fluoro-pedrizite'	NaLi₂(LiFe²⁺₂Fe³⁺₂)(Si₈O₂₂)F₂
9.DE.25	'Ferro-nybøite'	NaNa₂(Fe²⁺₃Al₂)(AlSi₇O₂₂)(OH)₂	Mon.
9.DE.25	'Clino-ferro-ferri-fluoro-holmquistite'	◻{Li₂}{Fe²⁺₃Fe³⁺₂}(Si₈O₂₂)F₂
9.DE.25	Mangano-mangani-ungarettiite	NaNa₂(Mn²⁺₂Mn³⁺₃)(Si₈O₂₂)O₂	Mon. 2/m : B2/m
9.DE.25	'Clino-ferri-fluoro-holmquistite'	◻{Li₂}{Mg₃Fe³⁺₂}(Si₈O₂₂)F₂
9.DE.25	'Clino-ferro-fluoro-holmquistite'	◻{Li₂}{Fe²⁺₃Al₂}(Si₈O₂₂)F₂

Other InformationHide

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for EckermanniteHide

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for EckermanniteHide

Reference List:

[1]Adamson, Olge J. (1942) Eckermannite, a new alkali amphibole. Geologiska Föreningen i Stockholm Förhandlingar, 64 (3) 329-334 doi:10.1080/11035894209446082

Sundius, N. (1946) The composition of eckermannite and its position in the amphibole group. Avhandlingar och uppsatser. Serie C 475. Sveriges Geologiska Undersökning 7pp.

Leake, Bernard E. (1978) Nomenclature of amphiboles. American Mineralogist, 63 (11-12) 1023-1052

Leake, B. E., Woolley, A. R., Arps, C. E. S., Birch, W. D., Gilbert, M. C., Grice, J. D., Hawthorne, F. C., Kato, A., Kisch, H. J., Krivovochev, V. G., Linthout, K., Laird, J., Mandarino, J. A., Maresch, W. V., Nickel, E.H., Rock, N. M. S., Schumacher, J. C., Smith, D. C., Stephenson, N. C. N., Ungaretti, L., Whittaker, E. J. W., Youzhi, Gou (1997) Nomenclature of amphiboles: report of the Subcommittee on Amphiboles of the International Mineralogical Association, Commission on New Minerals and Mineral Names. The Canadian Mineralogist, 35 (1) 219-246

Leake, B. E., Woolley, A. R., Birch, W. D., Burke, E. A.J., Ferraris, G., Grice, J. D., Hawthorne, F. C., Kisch, H. J., Krivovichev, V. G., Schumacher, J. C., Stephenson, N. C.N., Whittaker, E. J.W. (2003) Nomenclature of amphiboles: Additions and revisions to the International Mineralogical Association's 1997 recommendations. The Canadian Mineralogist, 41 (6) 1355-1362 doi:10.2113/gscanmin.41.6.1355

Hawthorne, F. C., Oberti, R. (2006) On the classification of amphiboles. The Canadian Mineralogist, 44 (1) 1-21 doi:10.2113/gscanmin.44.1.1

[2]Hawthorne, F. C., Oberti, R., Harlow, G. E., Maresch, W. V., Martin, R. F., Schumacher, J. C., Welch, M. D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist, 97 (11) 2031-2048 doi:10.2138/am.2012.4276

Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2014) New minerals and nomenclature modifications approved in 2014, CNMNC Newsletter No 20. Mineralogical Magazine, 78 (3) 549-558 doi:10.1180/minmag.2014.078.3.05

Oberti, R., Boiocchi, M., Hawthorne, F. C., Ball, N. A., Harlow, G. E. (2015) Eckermannite revised: The new holotype from the Jade Mine Tract, Myanmar--crystal structure, mineral data, and hints on the reasons for the rarity of eckermannite. American Mineralogist, 100 (4) 909-914 doi:10.2138/am-2015-5132

Danisi, Rosa Micaela, Armbruster, Thomas (2017) Crystal structure of potassic-mangani-leakeite from the Wessels Mine, Kalahari Manganese Field, South Africa. European Journal of Mineralogy, 29 (1) 142-147 doi:10.1127/ejm/2017/0029-2588

(2017) Eckermannite. Handbook of Mineralogy. Mineralogical Society of America

Howe, Harriet, Pawley, Alison R., Welch, Mark D. (2018) Sodium amphibole in the post-glaucophane high-pressure domain: The role of eckermannite. American Mineralogist, 103 (6) 989-992 doi:10.2138/am-2018-6399

Localities for EckermanniteHide

Showing 52 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

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Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Angola
Namibe Province Camacuio ⓘ Lutala Complex	Lapido-Loureiro +2 other references
ⓘ Nejoio Complex	Rodrigues +1 other reference

Antarctica
East Antarctica Victoria Land ⓘ ~~Mount Rittmann~~	Armienti et al. (1991)

Brazil
Minas Gerais Araxá ⓘ Barreiro ?	Berger et al. (2009) +1 other reference
Ubá ⓘ Ubari ?

Bulgaria
Sofia Province Svoge Municipality Svidnya ⓘ ~~Svidnya Complex~~	Grozdanov +4 other references
Stara Zagora Province Kazanlak Municality Shipka ⓘ Shipka Outcrops	Dyulgerov +2 other references

Cameroon
Southwest Region Manyu Mamfe ⓘ Nda-Ali Massif	Dessauvage +2 other references

Cape Verde
Barlavento Islands ⓘ Boa Vista Island	Figueiredo et al. (1989) +9 other references

China
Inner Mongolia Baotou City Bayan Obo mining district ⓘ Bayan Obo deposit	Liu et al. (2026)
Liaoning Dandong Kuandian County ⓘ Saima U-REE deposit ?	Yiming Zhao and Daxin Li (2003)

Czech Republic
Central Bohemian Region Rakovník District Čistá Čistá ring ⓘ Hůrky	Bernard J. H. et al. (1981) +1 other reference
Ústí nad Labem Region Litoměřice District Jenčice ⓘ Koštál Diatreme	Kopecký et al. (1970) +1 other reference

DR Congo
North Kivu Rutshuru Territory Bwito ⓘ Lueshe Mine	doi.org/10.1016/0899-5362 (89) +13 other references

Finland
Lapland Savukoski Tulppio ⓘ Sokli carbonatite complex	Vartiainen (1980)
North Karelia Juuka ⓘ Panjavaara carbonate veins and dikes	Torppa +1 other reference

Greenland
Sermersooq Kangerlussuaq Fjord ⓘ Gardiner Complex ?	Petersen et al. (1985)

India
Madhya Pradesh Jhabua District ⓘ Kajlidongri Mine ?	Nayak et al. (1975)
Rajasthan Udaipur Division Udaipur District ⓘ Newania carbonatite-fenite complex	Randive et al. (2020)

Italy
Aosta Valley Nus Saint-Barthélemy ⓘ Varenche Mine ?	Barresi et al. (2005)
Piedmont Verbano-Cusio-Ossola Province Mergozzo Candoglia ⓘ Candoglia marble quarries ?	Piccoli et al. (2007)

Japan
Iwate Prefecture Shimohei District Tanohata ⓘ Tanohata mine ?	- (n.d.)
Niigata Prefecture ⓘ Itoigawa City	wwwsoc.nii.ac.jp/jampeg/93-11.htm.
Ōmi ⓘ Hime River (Himekawa) ?	Fossa Magna Museum specimen
ⓘ Yamanobo	Suzuki Y and Ohki Y (2019) +2 other references

Madagascar
Bongolava Tsiroanomandidy District Ambatolampy Commune ⓘ Ambohiby Massif ?	Mukosi (2012)
Diana Ambanja District Antsirabe ⓘ Ampasibitika ?	Rakotovao (2009)

Malawi
Southern Region Machinga ⓘ Junguni Hill	Bloomfield (1965) +4 other references

Myanmar (TL)
Kachin State Mohnyin District Hpakant Township (Hpakan; Phakant; Phakan) ⓘ Hpakant-Tawmaw Jade Tract (TL)	Shi et al. (2011) +4 other references
ⓘ Hpakant (Hpakan; Phakant; Phakan)	Shi et al. (2012)
ⓘ Tawmaw (Tawhmaw; Taw Maw)	Nyunt (2009) +1 other reference

Norway
Vestland Askvoll Dalsfjorden ⓘ ~~Heilefjellet dikes~~	Furnes et al. (1982)

Romania
Suceava County Iacobeni ⓘ Arșița mine ?	minerals-of-the-carpathians.eu (2008)

Russia
Murmansk Oblast ⓘ Niva alkaline intrusion	Arzamastseva et al. (1999) +1 other reference
ⓘ Sakha	[World of Stones 12:49]
Aldan ⓘ Inagli Massif	Ponomarchuk et al. (2019)
ⓘ Inagli chrome-diopside deposit ?	geo.web.ru (2007) +1 other reference

Saudi Arabia
Medina Region ⓘ Abu Safiyah Complex	Kemp (1981)

Spain
Canary Islands Las Palmas Province Gran Canaria Arucas ⓘ Montaña Cardones ?	Hernandez-Pacheco et al. (1969)

Sweden
Jönköping County Jönköping Gränna ⓘ ~~Norra Kärr~~	Amer. Mineral. +12 other references
ⓘ ~~Kaxtorpite outcrop~~	Amer. Mineral. +3 other references
Örebro County Hällefors Grythyttan ⓘ Brunnsjögruvan ?	Victoria Museum Specimen
Västernorrland County Sundsvall ⓘ Alnö Complex	Kresten +19 other references

UK
Scotland Highland North， West and Central Sutherland Loch Loyal Complex ⓘ Beinn Laoghal	Robertson et al. (1974) +1 other reference

USA
Alaska Yukon-Koyukuk Census Area Iditarod Mining District ⓘ Yankee Creek Mine ?	- (2008)
California Humboldt County ⓘ ~~Coyote Peak~~	... +1 other reference
Colorado Boulder County Lake Albion ⓘ Snowy Range Mine ?	Eckel et al. (1997)
Jackson County Pearl Mining District ⓘ Troutman Draw ?	Eckel et al. (1997)
New Hampshire Carroll County Conway North Conway ⓘ Hurricane Mountain localities ?	Rocks and Minerals (1990)

Yemen
Al Mahwit Governorate ⓘ Jabal Hufash Granite	Civetta et al. (1978) +1 other reference
Raymah Governorate ⓘ Jabal Raymah Pluton	Grolier et al. (1978) +2 other references
Taiz Governorate ⓘ Jabal Sabir	Civetta et al. (1978) +1 other reference

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Eckermannite

About EckermanniteHide

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