General Information
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 Chemical Formula: |
Na2(Si,Al,Be)7(O,OH,F)14 |
| Composition: |
Molecular Weight = 425.47 gm) |
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| Empirical Formula: |
Na2Si3.6Al2.1Be0.7O8.4(OH)3.2F1.4 |
| Environment: |
Cavities in alkali-pegmatite veins. |
| Locality: |
Narsarsuk, Greenland. |
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Classification
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| Dana Class: |
78.7.10.1 (78)Unclassified silicates |
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(78.7)wholly unclassified silicates |
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(78.7.10)Dana Group |
| Strunz Class: |
VIII/J.10-10 VIII - Silicates |
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VIII/J - Tectosilicates (network) with anions unfamiliar to the tetraheders |
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VIII/J.10 - Leifite series |
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Crystallography
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| Axial Ratios: |
a:c = 1:0.33807 |
| Cell Dimensions: |
a = 14.352, c = 4.852, Z = 1; V = 865.52 Den(Calc)= 0.82 |
| Crystal System: |
Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: P3m1- |
| X Ray Diffraction: |
By Intensity(I/Io): 3.151(1) 3.375(0.7) 4.698(0.4) |
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Physical Properties
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| Cleavage: |
[???] Good, [???] Good |
| Color: |
colorless or white. |
| Density: |
2.57 |
| Diaphaniety: |
Transparent |
| Habits: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Pseudo Hexagonal - Crystals show a hexagonal outline., |
| Hardness: |
6 - Orthoclase |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties
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| Optical Data: |
Uniaxial (+), w=1.5117, e=1.5224, bire=0.0107. |
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Other Information
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| References: |
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) |
| See Also: |
Links to other databases for Leifite :
1 -Athena Mineralogy
2 - EUROmin Project
3 -MinDat.org Location Data
4 -MinMax
5 -The Mineral Gallery
6 -WWW-MINCRYST
7 -École des Mines de Paris
Search for Leifite using:
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Ask about Leifite here :
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