Eskolaite
Eskolaite is a rare chromium oxide mineral (chromium(III) oxide Cr2O3).
| Eskolaite | |
|---|---|
Eskolaite from Russia | |
| General | |
| Category | Oxide mineral |
| Formula (repeating unit) | Cr2O3 |
| IMA symbol | Esk |
| Strunz classification | 4.CB.05 |
| Crystal system | Trigonal |
| Crystal class | Hexagonal scalenohedral (3 m) H-M symbol: (3 2/m) |
| Space group | R3c, No. 167 |
| Unit cell | a = 4.95, c = 13.58 [Å]; Z = 6 |
| Identification | |
| Color | Black to dark green |
| Crystal habit | Hexagonal prisms and plates |
| Cleavage | None |
| Tenacity | Brittle |
| Mohs scale hardness | 8 – 8.5 |
| Luster | Vitreous or metallic |
| Streak | Pale green |
| Diaphaneity | Opaque, translucent in thin edges |
| Specific gravity | 5.18 |
| Density | Measured: 5.18 g/cm3, Calculated: 5.20 g/cm3 |
| Optical properties | Uniaxial |
| Pleochroism | Noted; emerald-green to olive-green |
| References | |
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