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.

Name Pronunciation:

Intersilite + Pronunciation

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),

Crystal Structure:

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

Physical Properties of Intersilite

Cleavage:

{100} Perfect

Color:

Yellow, Pinkish yellow, Pink.

Density:

2.42

Diaphaneity:

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
Ncalc = 1.54 - 1.56

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:

Bulk Density (Electron Density)=2.34 gm/cc
note: Specific Gravity of Intersilite =2.35 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Intersilite= 3.31 barns/electron
U=PE_Intersilite x rElectron Density= 7.74 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Intersilite is Not Radioactive

Intersilite Classification

Dana Class:

74.03.08.01 (74)Phyllosilicate Modulated Layers

(74.03)with joined strips

(74.03.08)Dana Group

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

Strunz Class:

09.EE.60 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EE -Single tetrahedral nets of 6-membered rings

09.EE.60 Intersilite! Na6MnTi[Si10O24(OH)](OH)3•4(H2O) I2/m 2/m

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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Intersilite Specimen Label here :

Intersilite

Na6Mn++Ti[Si10O24(OH)](OH)3•4(H2O)
Dana No: 74.03.08.01 Strunz No: 09.EE.60
Locality:

Notes: