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Barrerite

A valid IMA mineral species

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Barrerite

Rocky Pass, Petersburg Borough, Alaska, USA

Barrerite

Kupreanof Island, Petersburg Borough, Alaska, USA

Barrerite

Rocky Pass, Petersburg Borough, Alaska, USA

Barrerite

Kupreanof Island, Petersburg Borough, Alaska, USA

Barrerite

Rocky Pass, Petersburg Borough, Alaska, USA

Barrerite

Rocky Pass, Petersburg Borough, Alaska, USA

Barrerite

Kupreanof Island, Petersburg Borough, Alaska, USA

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About BarreriteHide

Formula:

Na₂(Si₇Al₂)O₁₈ · 6H₂O

Usually not pure, but containing also minor K and Ca. Formula also given as (Na,K,Ca_0.5)₂[Al₂Si₇O₁₈] · 7H₂O.

Colour:

White, Pink

Lustre:

Vitreous

Hardness:

3 - 4

Specific Gravity:

2.3

Crystal System:

Orthorhombic

Member of:

Stilbite Subgroup > Zeolite Group

Name:

Named for Richard Maling Barrer (1910-1996), New Zealand-born British teacher and student of the chemistry of zeolites.

Type Locality:

ⓘ Sant' Efisio Tower (Punta del Coltellazzo), Capo di Pula (Capo Pula; Nora), Pula, Metropolitan City of Cagliari, Sardinia, Italy

Zeolite Group.

Compare stilbite-Na.

Unique IdentifiersHide

Mindat ID:

536

Long-form identifier:

mindat:1:1:536:6

Similar NamesHide

Bararite

A valid IMA mineral species - grandfathered

(NH₄)₂[SiF₆]

IMA Classification of BarreriteHide

IMA status:

Approved

IMA Formula:

Na₂(Al₂Si₇)O₁₈·6H₂O

First published:

1974

Type description reference:

Passaglia, E., Pongiluppi, D. (1974) Sodian stellerite from Capo Pula, Sardegna. Lithos, 7 (2) 69-73 doi:10.1016/0024-4937(74)90019-x

Classification of BarreriteHide

Strunz-mindat (2026):

9.GE.15

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H₂O; zeolite family
E : Chains of T₁₀O₂₀ Tetrahedra

Dana 7th ed.:

77.1.4.5

Dana 8th ed.:

77.1.4.5

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites

Hey's CIM Ref.:

16.10.14

16 : Silicates Containing Aluminum and other Metals
10 : Aluminosilicates of Ca and alkalis

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
Bre	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
Brr	The Canadian Mineralogist (2019)	The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of BarreriteHide

Lustre:

Vitreous

Transparency:

Transparent, Translucent

Colour:

White, Pink

Streak:

White

Hardness:

3 - 4 on Mohs scale

Cleavage:

Perfect
on {010}

Density:

2.3 g/cm³ (Measured) 2.08 g/cm³ (Calculated)

Optical Data of BarreriteHide

Type:

Biaxial (-)

RI values:

n_α = 1.4791 n_β = 1.4851 n_γ = 1.4891

2V:

Measured: 78° , Calculated: 78°

Max. Birefringence:

δ = 0.010
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:

Moderate (negative)
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.

Thickness: 30 µm

Stage rotation: 0°

Dispersion:

none

Chemistry of BarreriteHide

Mindat Formula:

Na₂(Si₇Al₂)O₁₈ · 6H₂O

Usually not pure, but containing also minor K and Ca. Formula also given as (Na,K,Ca_0.5)₂[Al₂Si₇O₁₈] · 7H₂O.

Element Weights:

Element	% weight
O	55.439 %
Si	28.385 %
Al	7.791 %
Na	6.639 %
H	1.746 %

Calculated from ideal end-member formula.

Elements listed:

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

Common Impurities:

Ca,K,Fe,Mn,Mg,Sr,Ba

Crystallography of BarreriteHide

Crystal System:

Orthorhombic

Class (H-M):

mmm(2/m2/m2/m) - Dipyramidal

Cell Parameters:

a = 13.634 Å, b = 18.206 Å, c = 17.845 Å

Ratio:

a:b:c = 0.749 : 1 : 0.98

Unit Cell V:

4,429.50 Å³ (Calculated from Unit Cell)

Comment:

Non-standard space-group setting Amma

Crystal StructureHide

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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4

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CIF File Best | x | y | z | a | b | c

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

ID	Species	Reference	Year	Locality	Temp (K)
0014405	Barrerite	Sacerdoti M, Sani A, Vezzalini G (1999) Structural refinement of two barrerites from Alaska Microporous and Mesoporous Materials 30 103-109	1999	Kuiu Island, Alaska, USA	293
0014404	Barrerite	Sacerdoti M, Sani A, Vezzalini G (1999) Structural refinement of two barrerites from Alaska Microporous and Mesoporous Materials 30 103-109	1999	Kuiu Island, Alaska, USA	293
0004773	Barrerite	Ori S, Mazzucato E, Vezzalini G (2009) Dehydration dynamics of barrerite: An in situ synchrotron XRPD study American Mineralogist 94 64-73	2009	Kuiu Island, Alaska	339
0004774	Barrerite	Ori S, Mazzucato E, Vezzalini G (2009) Dehydration dynamics of barrerite: An in situ synchrotron XRPD study American Mineralogist 94 64-73	2009	Kuiu Island, Alaska	482
0004775	Barrerite	Ori S, Mazzucato E, Vezzalini G (2009) Dehydration dynamics of barrerite: An in situ synchrotron XRPD study American Mineralogist 94 64-73	2009	Kuiu Island, Alaska	637

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Barrerite'
loop_
_publ_author_name
'Sacerdoti M'
'Sani A'
'Vezzalini G'
_journal_name_full 'Microporous and Mesoporous Materials'
_journal_volume 30 
_journal_year 1999
_journal_page_first 103
_journal_page_last 109
_publ_section_title
;
 Structural refinement of two barrerites from Alaska
 Note: sample 3
;
_database_code_amcsd 0014405
_chemical_compound_source 'Kuiu Island, Alaska, USA'
_chemical_formula_sum 'Na2.79 Ca.97 K1.68 (Si14.026 Al3.974) O46.3 H20.6'
_cell_length_a 13.586
_cell_length_b 18.184
_cell_length_c 17.812
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 4400.417
_exptl_crystal_density_diffrn      2.161
_symmetry_space_group_name_H-M 'A m m a'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2+y,1/2+z'
  '1/2+x,y,-z'
  '1/2+x,1/2+y,1/2-z'
  '1/2-x,-y,z'
  '1/2-x,1/2-y,1/2+z'
  'x,-y,z'
  'x,1/2-y,1/2+z'
  '-x,y,-z'
  '-x,1/2+y,1/2-z'
  '1/2-x,y,z'
  '1/2-x,1/2+y,1/2+z'
  '1/2+x,-y,-z'
  '1/2+x,1/2-y,1/2-z'
  '-x,-y,-z'
  '-x,1/2-y,1/2-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
NaC1   0.25000   0.00000   0.04750   0.23000   0.03500
CaC1p   0.25000   0.00000   0.45640   0.97000   0.05300
NaC2   0.03500   0.06800   0.03500   0.12000   0.05300
KC2p   0.10300   0.08900   0.44400   0.42000   0.16000
NaC2p   0.10300   0.08900   0.44400   0.42000   0.16000
NaC3   0.15500   0.00000   0.25000   0.20000   0.13200
SiT1   0.13522   0.30239   0.12446   0.77920   0.01120
AlT1   0.13522   0.30239   0.12446   0.22080   0.01120
SiT1p   0.13671   0.31363   0.37182   0.77920   0.01170
AlT1p   0.13671   0.31363   0.37182   0.22080   0.01170
SiT3   0.05197   0.41066   0.24084   0.77920   0.01230
AlT3   0.05197   0.41066   0.24084   0.22080   0.01230
SiT4   0.13828   0.18534   0.25519   0.77920   0.01120
AlT4   0.13828   0.18534   0.25519   0.22080   0.01120
SiT5   0.00000   0.23602   0.00000   0.77920   0.01370
AlT5   0.00000   0.23602   0.00000   0.22080   0.01370
O1   0.07340   0.29070   0.04810   1.00000   0.02890
O1p   0.06480   0.31890   0.44440   1.00000   0.02530
O3   0.11740   0.23480   0.18150   1.00000   0.03290
O3p   0.12570   0.23330   0.33170   1.00000   0.02470
O4   0.10270   0.37990   0.16240   1.00000   0.03050
O4p   0.11220   0.38070   0.31510   1.00000   0.03050
O7   0.25000   0.30760   0.09960   1.00000   0.03520
O7p   0.25000   0.32450   0.40190   1.00000   0.02300
O8   0.06580   0.11510   0.25700   1.00000   0.02950
O9   0.05640   0.50000   0.23870   1.00000   0.03060
O10   0.25000   0.15200   0.25230   1.00000   0.02590
Wat1   0.20600   0.11800   0.06100   0.18000   0.04400
Wat1p   0.19200   0.11800   0.44600   0.22000   0.05100
Wat2   0.25000   0.12550   0.05870   0.63000   0.07400
Wat2p   0.25000   0.13200   0.44800   0.30000   0.05200
Wat3   0.19000   0.00000   0.17700   0.28000   0.07800
Wat3p   0.25000   0.00000   0.32500   0.32000   0.04100
Wat4   0.12300   0.00000   0.13500   0.52000   0.15800
Wat4p   0.19500   0.00000   0.32500   0.34000   0.05400
Wat5   0.17800   0.50000   0.07700   0.28000   0.05500
Wat5p   0.17800   0.50000   0.41300   0.10000   0.05200
Wat6   0.10200   0.50000   0.06600   0.71000   0.11200
Wat6p   0.10800   0.50000   0.45300   0.92000   0.16600
Wat8   0.25000   0.50000   0.08600   0.12000   0.04800
Wat8p   0.25000   0.50000   0.35260   0.10000   0.01840

X-Ray Powder DiffractionHide

Loading XRD data...

2θ (degrees) d-spacing (Å)

Data courtesy of RRUFF project at University of Arizona, used with permission.

Powder Diffraction Data:

d-spacing	Intensity
9.10 Å	(> 100)
4.054 Å	(100)
3.028 Å	(80)
3.004 Å	(25)
4.659 Å	(20)
2.773 Å	(20)
1.8192 Å	(17)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 3a: Earth’s earliest Hadean crust	>4.50
10 : Basalt-hosted zeolite minerals

Type Occurrence of BarreriteHide

Type Locality:

ⓘ Sant' Efisio Tower (Punta del Coltellazzo), Capo di Pula (Capo Pula; Nora), Pula, Metropolitan City of Cagliari, Sardinia, Italy

General Appearance of Type Material:

As well-formed, laminar crystals, to 5 mm

Place of Conservation of Type Material:

University of Modena, Modena, Italy; National Museum of Natural History, Washington, D.C., USA, 128521.

Geological Setting of Type Material:

On the walls of large fractures in deeply weathered andesitic and rhyolitic lavas

Associated Minerals at Type Locality:

Heulandite Subgroup

Reference:

Passaglia, E., Pongiluppi, D. (1974) Sodian stellerite from Capo Pula, Sardegna. Lithos, 7 (2) 69-73 doi:10.1016/0024-4937(74)90019-x

Other Language Names for BarreriteHide

Dutch:Barreriet

German:Barrerit

Russian:Баррерит

Simplified Chinese:板沸石

Spanish:Barrerita

Relationship of Barrerite to other SpeciesHide

Member of:

Stilbite Subgroup > Zeolite Group

Other Members of Stilbite Subgroup:

Stellerite	Ca₄(Si₂₈Al₈)O₇₂ · 28H₂O	Orth. mmm(2/m2/m2/m) : Fmmm
Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O	Mon. 2/m : B2/m
Stilbite-Na	Na₉(Si₂₇Al₉)O₇₂ · 28H₂O	Mon. 2/m : B2/m

Common AssociatesHide

Associations Based on Photo Data:

17 photos of Barrerite associated with Quartz	SiO₂
9 photos of Barrerite associated with Calcite	CaCO₃
7 photos of Barrerite associated with Pyrite	FeS₂
2 photos of Barrerite associated with Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
1 photo of Barrerite associated with Stilbite-Na	Na₉(Si₂₇Al₉)O₇₂ · 28H₂O
1 photo of Barrerite associated with Heulandite-Ca	(Ca,Na)₅(Si₂₇Al₉)O₇₂ · 26H₂O
1 photo of Barrerite associated with Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O

Related Minerals - Strunz-mindat Grouping Hide

9.GE.05	Heulandite-Ca	(Ca,Na)₅(Si₂₇Al₉)O₇₂ · 26H₂O	Mon. 2/m : B2/m
9.GE.05	Heulandite-K	(K,Ca,Na)₅(Si₂₇Al₉)O₇₂ · 26H₂O	Mon. 2/m : B2/m
9.GE.05	Heulandite-Na	(Na,Ca,K)₆(Si,Al)₃₆O₇₂ · 22H₂O	Mon. m : Bm
9.GE.05	Heulandite-Sr	(Sr,Na,Ca)₅(Si₂₇Al₉)O₇₂ · 24H₂O	Mon. m : Bm
9.GE.05	Heulandite-Ba	(Ba,Ca,K)₅(Si₂₇Al₉)O₇₂ · 22H₂O	Mon. 2/m : B2/m
9.GE.05	Clinoptilolite-Ca	Ca₃(Si₃₀Al₆)O₇₂ · 20H₂O	Mon. 2/m
9.GE.05	Clinoptilolite-K	K₆(Si₃₀Al₆)O₇₂ · 20H₂O	Mon. 2/m
9.GE.05	Clinoptilolite-Na	Na₆(Si₃₀Al₆)O₇₂ · 20H₂O	Mon. 2/m : B2/m
9.GE.10	Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O	Mon. 2/m : B2/m
9.GE.10	Stilbite-Na	Na₉(Si₂₇Al₉)O₇₂ · 28H₂O	Mon. 2/m : B2/m
9.GE.15	Stellerite	Ca₄(Si₂₈Al₈)O₇₂ · 28H₂O	Orth. mmm(2/m2/m2/m) : Fmmm
9.GE.20	Brewsterite-Ba	Ba(Al₂Si₆)O₁₆ · 5H₂O	Mon. 2/m : P2₁/m
9.GE.20	Brewsterite-Sr	Sr(Al₂Si₆)O₁₆ · 5H₂O	Mon. 2/m : P2₁/m

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 BarreriteHide

mindat.org URL:

https://www.mindat.org/min-536.html
Please feel free to link to this page.

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External Links:

Look for Barrerite on Webmineral

Look for Barrerite on Wikipedia

Look for Barrerite on Mineralien Atlas

Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

Mineral Dealers:

Buy from D. Joyce minerals

References for BarreriteHide

Reference List:

Passaglia, E., Pongiluppi, D. (1974) Sodian stellerite from Capo Pula, Sardegna. Lithos, 7 (2) 69-73 doi:10.1016/0024-4937(74)90019-x(as sodian stellerite)

Passaglia, E., Pongiluppi, D. (1975) Barrerite, a new natural zeolite. Mineralogical Magazine, 40 (310) 208 doi:10.1180/minmag.1975.040.310.13

Galli, Ermanno, Alberti, Alberto (1975) The crystal structure of barrerite. Bulletin de Minéralogie, 98 (6) 331-340 doi:10.3406/bulmi.1975.7013

Fleischer, Michael, Pabst, Adolf, Cabri, Louis J. (1976) New Mineral Names. American Mineralogist, 61 (9-10) 1053-1056

Alberti, A., Cariati, F., Erre, L., Piu, P., Vezzalini, G. (1983) Spectroscopic investigation on the presence of OH in natural barrerite and in its collapsed phases. Physics and Chemistry of Minerals, 9 (5) 189-191 doi:10.1007/bf00311953

Sacerdoti, Michele, Gomedi, Isabetta (1984) Crystal structural refinement of Ca-exchanged barrerite. Bulletin de Minéralogie, 107 (6) 799-804 doi:10.3406/bulmi.1984.7821

Di Renzo, Francesco, Gabelica, Zelimir (1997) Barrerite and other zeolites from Kuiu and Kupreanof Islands, Alaska. The Canadian Mineralogist, 35 (3) 691-698

Coombs, Douglas S., Alberti, Alberto, Armbruster, Thomas, Artioli, Gilberto, Colella, Carmine, Galli, Ermanno, Grice, Joel D., Liebau, Friedrich, Mandarino, Joseph A., Minato, Hideo, et al. (1997) Recommended nomenclature for zeolite minerals; report of the Subcommittee on Zeolites of the International Mineralogical Association, Commission on New Minerals and Mineral Names. The Canadian Mineralogist, 35 (6). 1571-1606

Jambor, John L., Grew, Edward S., Roberts, Andrew C. (1998) New mineral names. American Mineralogist, 83 (11) 1347-1352

Sacerdoti, M., Sani, A., Vezzalini, G. (1999) Structural refinement of two barrerites from Alaska. Microporous and Mesoporous Materials: 30: 103-109. doi: 10.1016/S1387-1811(99)00028-1

Meneghinello, Elisabetta, Alberti, Alberto, Cruciani, Giuseppe, Sacerdoti, Michele, Intyre, Garry Mc, Ciambelli, Paolo, Rapacciuolo, Maria T. (2000) Single crystal neutron diffraction study of the natural zeolite barrerite in its ND4-exchanged form. European Journal of Mineralogy, 12 (6) 1123-1129 doi:10.1127/0935-1221/2000/0012-1123

(2001) Barrerite. Handbook of Mineralogy. Mineralogical Society of America

Sani, Alessandra, Delmotte, Luc, Marichal, Claire, Gabelica, Zelimir, Forte, Claudia (2001) 29Si, 27Al and 23Na MAS NMR study of the natural zeolite barrerite and its dehydrated phases. European Journal of Mineralogy, 13 (1) 101-111 doi:10.1127/0935-1221/01/0013-0101

Nishido, H., Akashi, H., Ohnishi, M., Fujimoto, M., Kobayashi, S., Kusachi, I. (2005) Barrerite first found from Hirado Island, Nagasaki Prefecture, Japan. In Abstracts for Annual Meeting of the Mineralogical Society of Japan 2005 Annual Meeting of the Mineralogical Society of Japan: 123-123.

Sacerdoti, Michele (2007) The crystal structure of zeolite barrerite dehydrated in air at 400–450 C. Microporous and Mesoporous Materials, 102 (1-3) 299-303 doi:10.1016/j.micromeso.2007.01.012

Ori, S., Mazzucato, E., Vezzalini, G. (2009) Dehydration dynamics of barrerite: An in situ synchrotron XRPD study. American Mineralogist, 94 (1) 64-73 doi:10.2138/am.2009.2914

Cametti, Georgia, Armbruster, Thomas, Nagashima, Mariko (2016) Thermal stability of barrerite and Na-exchanged barrerite: An in situ single crystal X-ray diffraction study under dry conditions. Microporous and Mesoporous Materials, 236. 71-78 doi:10.1016/j.micromeso.2016.08.023

Localities for BarreriteHide

Showing 32 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.

Hide all sections | Show all sections

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.


Antarctica
East Antarctica Buckley Island quadrangle ⓘ Lewis Cliff	Liu et al. (2015)

Argentina
Chubut Province Futaleufú Department ⓘ Futalaufquen Lake	R. S. Bowman and S. E. Delap (Eds.)
ⓘ Metamorphosed basalts	R. S. Bowman and S. E. Delap (Eds.)
Neuquén Province Los Lagos Department ⓘ Confluencia	Vattuone et al. (2001)

Canada
British Columbia Vancouver Island Victoria Mining Division ⓘ Metchosin Igneous Complex	Timpa et al. (2005)
Northwest Territories Mackenzie Mountains Tungsten (Cantung) ⓘ Cantung Mine	www.trinityminerals.com +1 other reference
Nova Scotia Colchester Co. ⓘ Five Islands	Pe-Piper et al. (2002)
Cumberland Co. ⓘ Cape d'Or (Cap d'Or)	Pe-Piper et al. (2002)
ⓘ Five Islands	Pe-Piper et al. (2002)
Parrsboro ⓘ Partridge Island	Pe-Piper et al. (2002)
West Bay ⓘ Cape Sharp	Pe-Piper et al. (2002)
Kings Co. ⓘ Morden	Pe-Piper (2000)
Ross Creek ⓘ Woodworth Cove	Pe-Piper (2000)

Ethiopia
Afar Region ⓘ Tendaho geothermal field	Gebregziabher (1998)

Italy
Sardinia Metropolitan City of Cagliari Pula ⓘ Capo di Pula (Capo Pula; Nora)	Passaglia et al. (1974) +7 other references
ⓘ Sant' Efisio Tower (Punta del Coltellazzo) (TL)	Passaglia et al. (1974) +7 other references
South Sardinia Province ⓘ Furtei	Fernando Caboni et al. (2024)
ⓘ Furtei mine	Fernando Caboni et al. (2024)

Japan
Nagasaki Prefecture Hirado City ⓘ Hirado Island	Nishido et al. (2005)

Norway
Nordland Vefsn ⓘ ~~Tosenveien (Fv 76)~~	King et al. (1993) +1 other reference

Romania
Cluj County Săndulești Copăceni ⓘ Metabasalt quarry	Kristály et al. (2003) +1 other reference

Russia
Kamchatka Krai Bystrinsky District Central Kamchatka mining district ⓘ Aginskoe Au deposit (Aginskoye deposit)	Okrugin et al. (2015)
Baranyevskoe ore field ⓘ Baranyevskoe deposit	Okrugin et al. (2015)
Yelizovsky District ⓘ Asachinskoe deposit	Okrugin et al. (2015)
ⓘ Mutnovskoe	Okrugin et al. (2015)
ⓘ Rodnikovoe	Okrugin et al. (2015)

USA
Alaska Petersburg Borough ⓘ Hound Island	June 1997 +3 other references
ⓘ Kuiu Island	Di Renzo et al. (1997) +1 other reference
ⓘ Kupreanof Island	June 1997 +3 other references
ⓘ Rocky Pass	Valange et al. (1996) +2 other references
Nevada Pershing County Seven Troughs Mining District ⓘ Unnamed outcrop	Castor et al. (2004)
Virginia Culpeper County Mitchell ⓘ Cedar Mountain Stone Corp. Quarry (A. H. Smith quarry)	Dietrich (1990)

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Barrerite

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