Zavaritskite
Zavaritskite is a rare mineral of the halide class, bismuth oxyhalide with the chemical formula (BiO)F. It is named after the Soviet geologist and petrographer, academician of the USSR Academy of Sciences Alexander Nikolaevich Zavaritsky. It was discovered in 1962 by Soviet scientists. Zavaritskite is part of matlockite group of minerals.
| Zavaritskite | |
|---|---|
| General | |
| Category | Halide mineral |
| Formula (repeating unit) | (BiO)F |
| IMA symbol | Zav |
| Strunz classification | III/D.10-70 |
| Dana classification | 10.02.01.01 |
| Crystal system | Tetragonal |
| Crystal class | Halide mineral |
| Identification | |
| Color | Colorless to white |
| Mohs scale hardness | 2–2.5 |
| Luster | Resinous to metallic |
| Streak | Gray white |
| Diaphaneity | Subtranslucent to opaque |
| Specific gravity | 8.44 gm/cc |
| Density | 7.88–9.00 (on average 8.44) g/sm3 |
| Optical properties | Uniaxial (+/−), a = 2.21, b = 2.213, bire = 0.0030 |
| Refractive index | nα = 2.210, nβ = 2.213 |
| Birefringence | δ = 2.210 |
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