| Mineral class | Sulphides : Chalcocite group |
| Chemical formula | Cu2Se |
| Crystal system | Cubic |
| Habitus | Crystals wery rare. As thin dendritic crusts, powdery inclusions or fine grained. |
| Cleavage | Fracture uneven, somewhat malleable. |
| Hardness | 2 |
| Density | 6.71 |
| Color | Silver white, but often with a black tarnish. |
| Streak | Shiny. |
| Luster | Metallic. |
| Description | |
| Occurance | In hydrothermal veins or calcite veins. |
| Associates | Other selenide minerals, eucairite, clausthalite, tiemannite, umangite, klockmannite, aguilarite, crookesite, athabascaite, stromeyerite, polybasite, pearceite, gold, uraninite, pyrite, marcasite, calcite. |
| Notes | Named after the Swedish chemist Jöns Jacob Berzelius (1779-1848), the discoverer of selenium. |
| Localities | A rare mineral Sweden :
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| To sulphides index. |
Mineral group index. |
Main index. |
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