Clausthalite is a lead selenide mineral, PbSe. It forms a solid solution series with galena PbS.
| Clausthalite | |
|---|---|
 | |
| General | |
| Category | Selenide mineral |
| Formula (repeating unit) | PbSe |
| IMA symbol | Cth[1] |
| Strunz classification | 2.CD.10 |
| Dana classification | 02.08.01.02 |
| Crystal system | Isometric |
| Crystal class | Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) |
| Space group | Fm3m |
| Identification | |
| Color | Bluish gray to lead-gray |
| Crystal habit | Massive to granular with euhedral crystals |
| Cleavage | {001} Perfect, {010} Perfect, {100} Perfect |
| Mohs scale hardness | 2.5 |
| Luster | Metallic |
| Streak | grayish black |
| Diaphaneity | opaque |
| Specific gravity | 7.6–8.8 |
| References | [2][3][4][5] |
It occurs in low-sulfur hydrothermal deposits with other selenides and in mercury deposits. It is associated with tiemannite, klockmannite, berzelianite, umangite, gold, stibiopalladinite and uraninite.[3]
It was first described in 1832 and named for the discovery locality of Clausthal-Zellerfeld in the Harz Mountains, Germany.[5]
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