Umangite

{{Infobox mineral | name = Umangite | category = Selenide mineral | boxwidth = | boxbgcolor = | image = Umangite-Clausthalite-202047.jpg | imagesize = | caption = Umangite (purple) on clausthalite. Other copper selenides (green secondaries) and likely chalcomenite (non-metallic blue) | formula = Cu3Se2 | IMAsymbol = Um<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref> | molweight = 348.56 g/mol | strunz = 2.BA.15c | color = Red, bluish red-black | habit = Massive granular | system = Tetragonal | class = Scalenohedral ({{overline|4}}2m) H-M symbol: ({{overline|4}} 2m) | symmetry = ''P''{{overline|4}}21m | twinning = | cleavage = Distinct on [010] and [001] | fracture = Uneven | mohs = 3 | luster = Metallic | refractive = | opticalprop = | birefringence = | pleochroism = | streak = Black | gravity = 5.62–6.78 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Opaque | other = | references = <ref>[http://webmineral.com/data/Umangite.shtml Webmineral data]</ref><ref>[http://www.mindat.org/min-4090.html Mindat.org]</ref><ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Umangite Mineralienatlas]</ref> }}

'''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== *List of minerals

==References==

Category:Copper(I,II) minerals Category:Selenide minerals Category:Tetragonal minerals Category:Minerals in space group 113