General Information
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 Chemical Formula: |
(Na,K)(Mg,Fe,Al)6(Si,Al)8O20(OH,F)4 |
| Composition: |
Molecular Weight = 843.71 gm) |
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| Empirical Formula: |
Na0.75K0.25Mg3.6Fe2+1.8Al2.6Si6O20(OH)3F |
| IMA Status: |
Approved IMA 1979 |
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Classification
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| Dana Class: |
71.2.2b.14 (71) |
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(71.2)Dana Type |
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(71.2.2b)Mica Group (Biotite subgroup) |
| Strunz Class: |
VIII/H.11-20 VIII - Silicates |
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VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups |
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VIII/H.11 - Mica group, Biotite series |
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Crystallography
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| Axial Ratios: |
a:b:c =0.5797:1:1.0722 |
| Cell Dimensions: |
a = 5.312, b = 9.163, c = 9.825, Z = 2; beta = 103.18ø V = 465.62 Den(Calc)= 6.02 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C2/m |
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Physical Properties
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| Cleavage: |
[001] Perfect |
| Color: |
yellow brown or dark brown. |
| Diaphaniety: |
Transparent to Translucent |
| Hardness: |
2.5-3 - Finger Nail-Calcite |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties
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| Optical Data: |
Biaxial (-), a=1.544, b=1.608, g=1.608, bire=0.0640, 2V(Calc)=0, 2V(Meas)=0-5. |
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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 Wonesite :
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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