General Information
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 Chemical Formula: |
K2ZrSi3O9·(H2O) |
| Composition: |
Molecular Weight = 689.36 gm) |
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| Empirical Formula: |
K2Zr4Si3O9·(H2O) |
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Classification
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| Dana Class: |
59.2.1.1 (59)Cyclosilicate Three-Membered Rings |
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(59.2)hydrated |
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(59.2.1)Umbite and related species |
| Strunz Class: |
VIII/F.20-10 VIII - Silicates |
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VIII/F - Inosilicates (chain and band) Triplet chains [Si3O9]6- |
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VIII/F.20 - Sorensenite - Para-umbite series |
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Crystallography
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| Axial Ratios: |
a:b:c =0.7709:1:0.5418 |
| Cell Dimensions: |
a = 10.208, b = 13.241, c = 7.174, Z = 4; V = 969.67 Den(Calc)= 4.72 |
| Crystal System: |
Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P212121 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.02(1) 5.91(0.9) 2.87(0.8) |
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Physical Properties
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| Cleavage: |
[010] Perfect, [100] Good |
| Color: |
colorless or yellowish white. |
| Density: |
2.79 |
| Diaphaniety: |
Transparent |
| Hardness: |
4.5 - Between Fluorite and Apatite |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties
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| Optical Data: |
Biaxial (-), a=1.596, b=1.619, g=1.63, bire=0.0340, 2V(Calc)=68, 2V(Meas)=80. |
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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: |
Links to other data for Umbite :
1 -Athena Mineralogy
2 - EUROmin Project
3 -MinDat.org Location Data
4 -MinMax
5 -WWW-MINCRYST
6 -École des Mines de Paris
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