Berzelianite | |
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![]() Berzelianite included in calcite from the Skrikerum mine in Sweden. | |
General | |
Category | Selenide minerals |
Formula (repeating unit) | Cu2Se |
IMA symbol | Brz[1] |
Strunz classification | 2.BA.20 |
Dana classification | 2.4.10.1 |
Crystal system | Isometric |
Identification | |
Color | Silvery white, tarnishes easily |
Crystal habit | Dendritic crusts, fine-grained inclusions |
Cleavage | None |
Fracture | Uneven |
Tenacity | Slightly malleable |
Mohs scale hardness | 2.7 |
Luster | Metallic |
Streak | Shining |
Diaphaneity | Opaque |
Density | 6.71 (measured) 7.28 (calculated) |
Ultraviolet fluorescence | None |
Common impurities | Ag |
References | [1][2][3] |
Berzelianite is a rare copper selenide mineral with the formula Cu2Se.[2][3][4] It occurs as thin dendritic crusts or as fine-grained inclusions. It crystallizes in the isometric system,[5][6][7] unlike its dimorph, bellidoite, which crystallizes in the tetragonal system.[8] The crystals are opaque and slightly malleable.