General Information
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 Chemical Formula: |
K2ZrSi6O15 |
| Composition: |
Molecular Weight = 577.92 gm) |
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| Empirical Formula: |
K2ZrSi6O15 |
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Classification
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| Dana Class: |
72.2.1.1 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings |
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(72.2)with 4-, 6-, and 8-membered rings |
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(72.2.1)Dalylite group |
| Strunz Class: |
VIII/H.03-20 VIII - Silicates |
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VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others |
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VIII/H.03 - Sanbornite series |
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Crystallography
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| Axial Ratios: |
a:b:c =0.9702:1:0.9055 |
| Cell Dimensions: |
a = 7.5, b = 7.73, c = 7, Z = 1; alpha = 106ø, beta = 113.5ø, gamma = 99.5ø V = 352.84 Den(Calc)= 2.72 |
| Crystal System: |
Triclinic - Pinacoidal H-M Symbol ( -1) Space Group: P1- |
| X Ray Diffraction: |
By Intensity(I/Io): 3.08(1) 3.58(1) 4.2(1) |
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Physical Properties
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| Cleavage: |
[101] Good, [010] Good, [100] Indistinct |
| Color: |
colorless. |
| Density: |
2.84 |
| Diaphaniety: |
Transparent |
| Hardness: |
7.5 - Garnet |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties
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| Optical Data: |
Biaxial (-), a=1.575, b=1.59, g=1.601, bire=0.0260, 2V(Calc)=80, 2V(Meas)=72. |
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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 Dalyite :
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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