Intersilite Mineral Data

Intersilite Mineral Data +

General Intersilite Information

Chemical Formula:

Na6Mn++Ti[Si10O24(OH)](OH)3·4(H2O)

Composition:

Molecular Weight = 1,045.69 gm

Sodium 13.19 % Na 17.78 % Na₂O

Titanium 4.58 % Ti 7.64 % TiO₂

Manganese 5.25 % Mn 6.78 % MnO

Silicon 26.86 % Si 57.46 % SiO₂

Hydrogen 1.16 % H 10.34 % H₂O

Oxygen 48.96 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₆Mn²⁺TiSi₁₀O₂₄(OH)₄·4(H₂O)

Environment:

In hyperagpaitic pegmatites.

IMA Status:

Approved IMA 1994 (Dana # Added)

Locality:

Mount Alluaiv in the northwestern part of the Lovozero alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named in allusion to it's intermediate position between the layered and banded silicates.

Synonym:

IMA1995-033

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Intersilite Crystallography

Axial Ratios:

a:b:c =0.6963:1:0.6552

Cell Dimensions:

a = 13.033, b = 18.717, c = 12.264, Z = 4; beta = 99.62° V = 2,949.59 Den(Calc)= 2.35

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 10.56(1), 3.196(0.8), 6.38(0.5),

Physical Properties of Intersilite

Cleavage:

[100] Perfect

Color:

Yellow, Pinkish yellow, Pink.

Density:

2.42

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Intersilite

Gladstone-Dale:

CI meas= 0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2318,KPDmeas= 0.2251,KC= 0.2318

Optical Data:

Biaxial (-), a=1.536, b=1.545, g=1.553, bire=0.0170, 2V(Calc)=86, 2V(Meas)=87. Dispersion r < v strong.

Calculated Properties of Intersilite

Electron Density:

r_electron=2.34 gm/cc
note: r_Intersilite=2.35 gm/cc.

Fermion Index

Fermion Index = 0.0187
Boson Index = 0.9813

Photoelectric:

PE_Intersilite= 3.31 barns/electron
U=PE_Intersilite x r_electron= 7.74 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Intersilite is Not Radioactive

Intersilite Classification

Dana Class:

74.3.8.1 (74)Phyllosilicate Modulated Layers

(74.3)with joined strips

(74.3.8)Dana Group

74.3.8.1 Intersilite ! Na6MnTi[Si10O24(OH)](OH)3·4(H2O) I2/m 2/m

Strunz Class:

VIII/H.33-80 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others

VIII/H.33 - Tuperssuatsiaite - Loughlinite series

VIII/H.33-10 Tuperssuatsiaite Na(Fe,Mn)3[Si8O20](OH)2·n(H2O) C 2/m Mono

VIII/H.33-20 Palygorskite (Mg,Al)2Si4O10(OH)·4(H2O) C 2/m 2/m

VIII/H.33-30 Yofortierite (Mn,Mg)5Si8O20(OH)2·8-9(H2O) Pn(?) m

VIII/H.33-40 Sepiolite Mg4Si6O15(OH)2·6(H2O) Pnan 2/m 2/m 2/m

VIII/H.33-50 Falcondoite (Ni,Mg)4Si6O15(OH)2·6(H2O) Pncn 2/m 2/m 2/m

VIII/H.33-60 Loughlinite Na2Mg3Si6O16·8(H2O) Unk Ortho

VIII/H.33-80 Intersilite Na6MnTi[Si10O24(OH)](OH)3·4(H2O) I2/m 2/m

VIII/H.33-90 Kalifersite! (K,Na)5Fe7Si20O50(OH)6·12(H2O) P1 1

Other Intersilite Information

References:

NAME( MinRec, Vol 28, No. 3) PHYS. PROP.(Eur. J. Min.,Vol.8,1996) OPTIC PROP.(MinRec, Vol 28, No. 3)

See Also:

Links to other databases for Intersilite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Intersilite

Na6Mn++Ti[Si10O24(OH)](OH)3·4(H2O)
Dana No: 74.3.8.1 Strunz No: VIII/H.33-80
Locality:

Notes: