Category Selenide mineral Strunz classification 2.BA.15c Space group P421m | Formula
(repeating unit) Cu3Se2 Crystal system Tetragonal | |
 | ||
Crystal class Scalenohedral (42m)
H-M symbol: (4 2m) | ||
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.
References
Umangite Wikipedia(Text) CC BY-SA