Tiemannite
Tiemannite is a mineral, mercury selenide, formula HgSe. It occurs in hydrothermal veins associated with other selenides, or other mercury minerals such as cinnabar, and often with calcite. Discovered in 1855 in Germany, it is named after Johann Carl Wilhelm Tiemann (1848–1899).
| Tiemannite | |
|---|---|
| General | |
| Category | Selenide mineral |
| Formula (repeating unit) | HgSe |
| IMA symbol | Tmn |
| Strunz classification | 2.CB.05a |
| Dana classification | 02.08.02.04 |
| Crystal system | Isometric |
| Crystal class | Hextetrahedral (43m) H-M symbol: (4 3m) |
| Space group | F43m |
| Identification | |
| Color | Steel-gray to black |
| Crystal habit | Massive and as euhedral crystals |
| Cleavage | none |
| Mohs scale hardness | 2.5 |
| Luster | Metallic |
| Streak | grayish black |
| Diaphaneity | opaque |
| Specific gravity | 8.19–8.47 |
| References | |
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