General Information
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 Chemical Formula: |
KFe++3AlSi3O10F2 |
| Composition: |
Molecular Weight = 515.87 gm) |
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| Empirical Formula: |
KFe2+3AlSI3O10F2 |
| Environment: |
F-analogue of annite |
| IMA Status: |
Proposed IMA 1999, Dana # Added |
| Name Origin: |
Commission on New Minerals and Mineral Names (CNMMN) |
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Classification
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| Dana Class: |
71.2.2b.17 (71) |
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(71.2)Dana Type |
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(71.2.2b)Mica Group (Biotite subgroup) |
| Strunz Class: |
VIII/HX.00-00 VIII - Silicates |
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VIII/HX - Unclassified Strunz Phyllosilicates |
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VIII/HX.00 - Unknown |
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Crystallography
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| Axial Ratios: |
a:b:c =0.5781:1:1.0931 |
| Cell Dimensions: |
a = 5.37, b = 9.289, c = 10.154, beta = 100.49ø V = 498.04 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C2/m |
| X Ray Diffraction: |
By Intensity(I/Io): 10.09(1) 3.336(0.56) 5.02(0.13) 1.671(0.1) 2.004(0.1) 2.507(0.1) 2.649(0.1) 2.933(0.1) 3.16(0.1) |
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Physical Properties
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| Color: |
iron black. |
| Diaphaniety: |
Translucent |
| Hardness: |
- |
| Luster: |
Sub Metallic |
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Optical Properties
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| Optical Data: |
Biaxial (-), a=1.596, b=1.648, g=1.648, bire=0.0520 |
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Other Information
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| References: |
NAME( CanMin, Vol 38) OPTIC PROP.(CanMin, Vol 38) |
| See Also: |
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