A.P. Khomyakov, A. Roberts, G.N. Nechelyustov, N.A. Yamnova, D.Yu. Pushcharovsky (1996) Intersilite Na6MnTi[Si10O24 (OH)](OH)3·4H2O—A new mineral with a new type of band-layered silicon-oxygen radical. Zapiski Vseross. Mineral. Obshch., 125(4), 79–85 (in Russian, English abs.)

Classification of IntersiliteHide

Strunz-mindat (2026):

9.EE.60

9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands

Mineral SymbolsHide

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

Symbol	Source	Reference for Standard
Isi	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of IntersiliteHide

Lustre:

Vitreous, Greasy

Transparency:

Transparent, Translucent

Colour:

Bright yellow color, rarely pinkish yellow or pink

Streak:

White

Hardness:

3 - 4 on Mohs scale

Tenacity:

Brittle

Cleavage:

Perfect
{100}

Fracture:

Step-Like

Density:

2.42 g/cm³ (Measured) 2.42 g/cm³ (Calculated)

Optical Data of IntersiliteHide

Type:

Biaxial (-)

RI values:

n_α = 1.536(2) n_β = 1.545(2) n_γ = 1.553(1)

2V:

Measured: 87° , Calculated: 86°

Max. Birefringence:

δ = 0.017
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

Dispersion:

r < v strong

Optical Extinction:

b = Z, c ∧ X = 40° in the acute angle β.

Pleochroism:

Weak

Comments:

Pale yellow to yellow.

Comments:

Absorption: Z > Y > X.

Chemistry of IntersiliteHide

Mindat Formula:

Na₆Mn²⁺Ti[Si₁₀O₂₄(OH)](OH)₃ · 4H₂O

Element Weights:

Element	% weight
O	48.962 %
Si	26.859 %
Na	13.191 %
Mn	5.254 %
Ti	4.578 %
H	1.157 %

Calculated from ideal end-member formula.

Elements listed:

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

Crystallography of IntersiliteHide

Crystal System:

Monoclinic

Cell Parameters:

a = 13.033(6) Å, b = 18.717(9) Å, c = 12.264(6) Å
β = 599.62(4)°

Ratio:

a:b:c = 0.696 : 1 : 0.655

Unit Cell V:

2,580.88 Å³ (Calculated from Unit Cell)

Comment:

space group I2/m

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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Stop | Start

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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)
0012349	Intersilite	Yamnova N A, Egorov-Tismenko Y K, Khomyakov A P (1996) Crystal structure of a new natural (Na,Mn,Ti)-phyllosilicate Crystallography Reports 41 239-244		1996	Aluaiv, Lovozero alkaline massif, Kola peninsula, Russia	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Intersilite'
loop_
_publ_author_name
'Yamnova N A'
'Egorov-Tismenko Y K'
'Khomyakov A P'
_journal_name_full 'Crystallography Reports'
_journal_volume 41 
_journal_year 1996
_journal_page_first 239
_journal_page_last 244
_publ_section_title
;
 Crystal structure of a new natural (Na,Mn,Ti)-phyllosilicate
;
_database_code_amcsd 0012349
_chemical_compound_source 'Aluaiv, Lovozero alkaline massif, Kola peninsula, Russia'
_chemical_formula_sum '(Mn.94 Fe.04 Ca.02) (Ti.75 Nb.25) Si10 Na5.8 K.45 (O32 H13)'
_cell_length_a 13.033
_cell_length_b 18.717
_cell_length_c 12.264
_cell_angle_alpha 90
_cell_angle_beta 99.62
_cell_angle_gamma 90
_cell_volume 2949.594
_exptl_crystal_density_diffrn      2.411
_symmetry_space_group_name_H-M 'I 1 2/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  'x,-y,z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
  '1/2-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
Mn   0.50000   0.58590   0.00000   0.94000   0.01292
Fe   0.50000   0.58590   0.00000   0.04000   0.01292
Ca   0.50000   0.58590   0.00000   0.02000   0.01292
Ti   0.00000   0.08420   0.00000   0.75000   0.02799
Nb   0.00000   0.08420   0.00000   0.25000   0.02799
Si1   0.22990   0.08180   0.14360   1.00000   0.00912
Si2   0.69730   0.41790   0.20050   1.00000   0.00659
Si3   0.71880   0.68530   0.02020   1.00000   0.00785
Si4   0.17450   0.30840   0.18690   1.00000   0.02191
Si5   0.79290   0.16020   0.07410   1.00000   0.00836
Na1   0.00000   0.25810   0.00000   1.00000   0.03546
Na2   0.03090   0.16950   0.25670   1.00000   0.02026
Na3   0.97450   0.00000   0.74780   1.00000   0.01773
Na4   0.50000   0.22830   0.00000   1.00000   0.05066
Na5   0.69290   0.00000   0.55540   0.25000   0.07979
K5   0.69290   0.00000   0.55540   0.25000   0.07979
Na6   0.62530   0.00000   0.06340   0.55000   0.05446
K6   0.62530   0.00000   0.06340   0.20000   0.05446
O-H1   0.92920   0.00000   0.06310   1.00000   0.02406
O2   0.27440   0.00000   0.14520   1.00000   0.01773
Wat3   0.91300   0.00000   0.54200   1.00000   0.04179
O4   0.10860   0.08660   0.14410   1.00000   0.01646
O5   0.57330   0.41060   0.16400   1.00000   0.01140
O6   0.39750   0.33060   0.03670   1.00000   0.02280
O7   0.91630   0.16410   0.07230   1.00000   0.01773
O8   0.26630   0.11990   0.03790   1.00000   0.01773
Wat9   0.55400   0.20490   0.18800   1.00000   0.09372
O10   0.76260   0.11350   0.17610   1.00000   0.01520
O11   0.19530   0.31650   0.06120   1.00000   0.02026
O12   0.24030   0.00000   0.70350   1.00000   0.01013
O13   0.00000   0.40000   0.00000   1.00000   0.12665
O14   0.29740   0.11500   0.25300   1.00000   0.02786
O15   0.75930   0.37460   0.11590   1.00000   0.01267
O16   0.73190   0.23540   0.07940   1.00000   0.02026
O17   0.75000   0.25000   0.75000   1.00000   0.10765
O-H18   0.05650   0.29430   0.18230   1.00000   0.08486
Wat19   0.50000   0.10280   0.00000   1.00000   0.12538
Wat20   0.58200   0.00000   0.68800   1.00000   0.07472

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
10.56 Å	(100)
6.38 Å	(50)
5.55 Å	(45)
4.78 Å	(40)
4.253 Å	(40)
3.196 Å	(80)
2.608 Å	(50)

Locality:

Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia

Reference:

Comments:

Alluaiv Mountain, Russia. Data from the type description.

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 4b: Highly evolved igneous rocks	>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of IntersiliteHide

Type Locality:

ⓘ Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia

General Appearance of Type Material:

Occurs as anhedral grains to 2 mm, and as aggregates to 3 mm.

Place of Conservation of Type Material:

A.E. Fersman Mineralogical Museum, Moscow, Russia.

Geological Setting of Type Material:

Hyperagpaitic pegmatites.

Associated Minerals at Type Locality:

Aegirine	Lomonosovite	Makatite	Manganoneptunite	Serandite
Steenstrupine-(Ce)	Villiaumite

Reference:

Synonyms of IntersiliteHide

IMA1995-033

Other Language Names for IntersiliteHide

Dutch:Intersiliet

German:Intersilit

Spanish:Intersilita

Related Minerals - Strunz-mindat Grouping Hide

9.EE.	Cairncrossite	Sr₂Ca_7-xNa_2x(Si₄O₁₀)₄(OH)₂(H₂O)_15-x	Tric. 1 : P1
9.EE.05	Bementite	Mn₇Si₆O₁₅(OH)₈	Mon.
9.EE.07	Innsbruckite	Mn₃₃(Si₂O₅)₁₄(OH)₃₈	Mon. m : Bm
9.EE.10	'Brokenhillite'	Mn₈Si₆O₁₅(OH)₁₀	Hex. 6mm : P6₃mc
9.EE.10	Mcgillite	(Mn,Fe)₈Si₆O₁₅(OH)₈Cl₂	Mon. 2/m : B2/m
9.EE.10	Friedelite	Mn²⁺₈Si₆O₁₅(OH,Cl)₁₀	Mon. 2/m : B2/m
9.EE.10	Pyrosmalite-(Mn)	Mn²⁺₈Si₆O₁₅(OH,Cl)₁₀	Trig. 3m(32/m) : P3m1
9.EE.10	Pyrosmalite-(Fe)	Fe²⁺₈Si₆O₁₅(OH,Cl)₁₀	Trig. 3m(32/m) : P3m1
9.EE.15	Nelenite	Mn²⁺₁₆As³⁺₃Si₁₂O₃₆(OH)₁₇	Trig. 3m(32/m) : R3m
9.EE.15	Schallerite	Mn²⁺₁₆As₃Si₁₂O₃₆(OH)₁₇	Trig. 3m : P3m1
9.EE.20	Palygorskite	◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O	Mon. 2/m : B2/m
9.EE.20	Yofortierite	Mn²⁺Mn²⁺₂Mn²⁺₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O	Mon. 2/m : B2/m
9.EE.20	Windhoekite	Fe³⁺(Fe³⁺_1.67◻_0.33)Ca₂◻₂Si₈O₂₀(OH)₂(H₂O)₄(OH)₂ · 6H₂O	Mon. 2/m : B2/m
9.EE.20	Windmountainite	◻Fe³⁺₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O	Mon. 2/m : B2/m
9.EE.20	Ikorskyite	KMn³⁺(Si₄O₁₀) · 3H₂O	Mon. 2/m : P2₁/b
9.EE.20	Tuperssuatsiaite	Fe³⁺Fe³⁺₂(Na◻)◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 2H₂O	Mon. 2/m : B2/m
9.EE.20	'Unnamed (Na-Ca-Fe-Silicate-Hydrate)'	NaCa(Fe²⁺,Al,Mn)₅[Si₈O₁₉(OH)](OH)₇ · 5H₂O	Tric. 1 : P1
9.EE.25	Sepiolite	Mg₄(Si₆O₁₅)(OH)₂ · 6H₂O	Orth. mmm(2/m2/m2/m) : Pnna
9.EE.25	Loughlinite	Na₂Mg₃Si₆O₁₆ · 8H₂O	Orth. mmm(2/m2/m2/m)
9.EE.25	Falcondoite	(Ni,Mg)₄Si₆O₁₅(OH)₂ · 6H₂O	Orth.
9.EE.25	Kalifersite	(K,Na)₅Fe³⁺₇Si₂₀O₅₀(OH)₆ · 12H₂O	Tric. 1 : P1
9.EE.30	Orlymanite	Ca₄Mn₃Si₈O₂₀(OH)₆ · 2H₂O	Hex.
9.EE.30	Tungusite	Ca₄Fe₂Si₆O₁₅(OH)₆	Tric. 1 : P1
9.EE.30	Gyrolite	NaCa₁₆Si₂₃AlO₆₀(OH)₈ · 14H₂O	Tric. 1 : P1
9.EE.35	Reyerite	(Na,K)₂Ca₁₄(Si,Al)₂₄O₅₈(OH)₈ · 6H₂O	Trig. 3 : P3
9.EE.35	Kodamaite	Na₃(Ca₅Na)Si₁₆O₃₆(OH)₄F₂ · (14-x)H₂O	Tric. 1 : P1
9.EE.35	Truscottite	(Ca,Mn)₁₄Si₂₄O₅₈(OH)₈ · 2H₂O	Trig.
9.EE.40	Natrosilite	Na₂Si₂O₅	Mon. 2/m : P2₁/b
9.EE.45	Makatite	Na₂Si₄O₈(OH)₂ · 4H₂O	Mon. 2/m : P2₁/b
9.EE.50	Varennesite	Na₈Mn₂Si₁₀O₂₅(OH,Cl)₂ · 12H₂O	Orth. mmm(2/m2/m2/m) : Cmcm
9.EE.55	Raite	Mn²⁺Mn²⁺₂Na₂(◻_1.75Ti_0.25)Si₈O₂₀(OH)₂(H₂O)₄ · Na(H₂O)₆	Orth. 222 : C222
9.EE.65	Zakharovite	Na₄Mn₅Si₁₀O₂₄(OH)₆ · 6H₂O	Trig. 3m
9.EE.65	Shafranovskite	Na₃K₂(Mn,Fe,Na)₄[Si₉(O,OH)₂₇](OH)₂ · nH₂O	Trig. 3m : P31c
9.EE.70	Zeophyllite	Ca₁₃Si₁₀O₂₈(OH)₂F₈ · 6H₂O	Trig. 3 : R3
9.EE.75	Minehillite	(K,Na)_2-3Ca₂₈Zn₄Al₄Si₄₀O₁₁₂(OH)₁₆	Hex.
9.EE.80	Fedorite	(Na,K)_2-3(Ca₄Na₃)Si₁₆O₃₈(OH,F)₂ · 3.5H₂O	Tric. 1 : P1
9.EE.80	Martinite	(Na,◻,Ca)₁₂Ca₄(Si,S,B)₁₄B₂O₃₈(OH,Cl)₂F₂ · 4H₂O	Tric. 1 : P1
9.EE.80	Ellingsenite	Na₅Ca₆Si₁₈O₃₈(OH)₁₃ · 6H₂O	Tric. 1 : P1
9.EE.85	Lalondeite	(Na,Ca)₆(Ca,Na)₃Si₁₆O₃₈(F,OH)₂ · 3H₂O	Tric. 1 : P1

Other InformationHide

Notes:

Readily soluble in 10% HCl or HNO3.

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 IntersiliteHide

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https://www.mindat.org/min-7111.html
Please feel free to link to this page.

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Mineral Dealers:

Buy from D. Joyce minerals

References for IntersiliteHide

Reference List:

Khomyakov, A.P., Roberts, A., Nechelyustov, G.N., Yamnova, N.A., Pushcharovsky, D.Yu. (1996) Intersilite Na6MnTi[Si10O24 (OH)](OH)3·4H2O—A new mineral with a new type of band-layered silicon-oxygen radical. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva, 125(4), 79–85 (in Russian, English abs.)

Yamnova, N.A., Egorov-Tismenko, Y.K., Khomyakov, A.P. (1996) Crystal structure of a new natural (Na,Mn,Ti)-phyllosilicate. Crystallography Reports, 41, 239-244.

Mandarino, Joseph A. (1997) Abstracts of New Mineral Descriptions. The Mineralogical Record, 28 (3) 219-224

Jambor, J.L., Puziewicz, J., Roberts, A.C. (1997) New mineral names. American Mineralogist: 82: 620-624.

Localities for IntersiliteHide

Showing 1 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.

Russia (TL)

Murmansk Oblast

Lovozersky District

ⓘ Alluaiv Mountain (TL)

Pekov (1998)

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Intersilite

About IntersiliteHide

Unique IdentifiersHide

IMA Classification of IntersiliteHide

Classification of IntersiliteHide

Mineral SymbolsHide

Physical Properties of IntersiliteHide

Optical Data of IntersiliteHide

Chemistry of IntersiliteHide

Crystallography of IntersiliteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of IntersiliteHide

Synonyms of IntersiliteHide

Other Language Names for IntersiliteHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for IntersiliteHide

References for IntersiliteHide

Localities for IntersiliteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide