Chemistry:Umangite
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| Umangite | |
|---|---|
 Umangite (purple) on clausthalite. Other copper selenides (green secondaries) and likely chalcomenite (non-metallic blue) | |
| General | |
| Category | Selenide mineral |
| Formula (repeating unit) | Cu3Se2 |
| Strunz classification | 2.BA.15c |
| Crystal system | Tetragonal |
| Crystal class | Scalenohedral (42m) H-M symbol: (4 2m) |
| Space group | P421m |
| Identification | |
| Formula mass | 348.56 g/mol |
| Color | Red, bluish red-black |
| Crystal habit | Massive granular |
| Cleavage | Distinct on [010] and [001] |
| Fracture | Uneven |
| Mohs scale hardness | 3 |
| |re|er}} | Metallic |
| Streak | Black |
| Diaphaneity | Opaque |
| Specific gravity | 5.62–6.78 |
| References | [1][2][3] |
Umangite is a copper selenide mineral, Cu3Se2, discovered in 1891. It occurs only in small grains or fine granular aggregates with other copper minerals of the sulfide group. It has a hardness of 3. It is blue-black to red-violet in color with a black streak. It has a metallic luster.
Umangite is named after the locality of Sierra de Umango, La Rioja province in Argentina . It also occurs at other localities including the Harz Mountains in Germany , and at Skrickerum, Sweden.
See also
References
- ↑ Webmineral data
- ↑ Mindat.org
- ↑ Mineralienatlas
- ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
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