General Information
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 Chemical Formula: |
KCa7(Ti,Zr)2Li3Si12O36F2 |
| Composition: |
Molecular Weight = 1,408.90 gm) |
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| Empirical Formula: |
KCa7Ti1.5Zr0.5Li3Si12O36F2 |
| IMA Status: |
Approved IMA 1975 |
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Classification
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| Dana Class: |
61.1.4.1 (61)Cyclosilicate Six-Membered Rings |
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(61.1)with [Si6O18] rings; possible (OH) and Al substitution |
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(61.1.4)Baratovite group |
| Strunz Class: |
VIII/E.14-10 VIII - Silicates |
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VIII/E - Cyklosilicates, six rings [Si6O18]12- |
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VIII/E.14 - Baratovite series |
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Crystallography
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| Axial Ratios: |
a:b:c =1.7381:1:2.1451 |
| Cell Dimensions: |
a = 16.94, b = 9.746, c = 20.907, Z = 4; beta = 112.5ø V = 3,188.94 Den(Calc)= 2.93 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C2/c |
| X Ray Diffraction: |
By Intensity(I/Io): 3.22(1) 2.41(0.2) 1.92(0.17) |
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Physical Properties
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| Cleavage: |
[001] Perfect |
| Color: |
pearl white. |
| Density: |
2.92 |
| Hardness: |
3.5 - Copper Penny |
| Luster: |
Pearly |
| Streak: |
white |
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Optical Properties
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| Optical Data: |
Biaxial (+), b=1.672, g=1.673, , 2V(Meas)=60. |
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Other Information
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| References: |
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
1 -Athena Mineralogy
2 - EUROmin Project
3 - Institute of Experimental Mineralogy (Russian Academy of Sciences)
4 -MinDat.org Location Data
5 -MinMax
6 -The Mineral Gallery
7 -École des Mines de Paris
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Pronunciation Guide 
