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Intersilite Mineral Data

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General Intersilite Information

Help on Chemical  Formula: Chemical Formula: Na6Mn++Ti[Si10O24(OH)](OH)3•4(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na6Mn2+TiSi10O24(OH)4•4(H2O)
Help on Environment: Environment: In hyperagpaitic pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1994 (Dana # Added)
Help on Locality: Locality: Mount Alluaiv in the northwestern part of the Lovozero alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in allusion to it's intermediate position between the layered and banded silicates.
Help on Name Pronunciation: Name Pronunciation: Intersilite + Pronunciation Say INTERSILITE
Help on Synonym: Synonym: IMA1995-033

Intersilite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6963:1:0.6552
Help on Cell Dimensions: Cell Dimensions: a = 13.033, b = 18.717, c = 12.264, Z = 4; beta = 99.62° V = 2,949.59 Den(Calc)= 2.35
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: I2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10.56(1), 3.196(0.8), 6.38(0.5),

Physical Properties of Intersilite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Yellow, Pinkish yellow, Pink.
Help on Density: Density: 2.42
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white

Optical Properties of Intersilite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.34 gm/cc
note: Specific Gravity of Intersilite =2.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEIntersilite = 3.31 barns/electron
U=PEIntersilite x rElectron Density= 7.74 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Intersilite is Not Radioactive

Intersilite Classification

Help on  Dana Class: Dana Class: (74)Phyllosilicate Modulated Layers
  (74.03)with joined strips
  (74.03.08)Dana Group Intersilite! Na6MnTi[Si10O24(OH)](OH)3•4(H2O) I2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( MinRec, Vol 28, No. 3) PHYS. PROP.(Eur. J. Min.,Vol.8,1996) OPTIC PROP.(MinRec, Vol 28, No. 3)
Help on See Also: 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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Dana No: Strunz No: 09.EE.60





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