umangite

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.

Key facts

Mineral.color: Red, bluish red-black
Mineral.name: Umangite
Mineral.category: Selenide mineral
Mineral.image: Umangite-Clausthalite-202047.jpg
Mineral.caption: Umangite (purple) on clausthalite. Other copper selenides (green secondaries) and likely chalcomenite (non-metallic blue)
Mineral.formula: Cu3Se2
Mineral.IMAsymbol: Um
Mineral.molweight: 348.56 g/mol
Mineral.strunz: 2.BA.15c
Mineral.habit: Massive granular
Mineral.system: Tetragonal
Mineral.class: Scalenohedral (2m) H-M symbol: ( 2m)
Mineral.symmetry: P21m
Mineral.cleavage: Distinct on [010] and [001]
Mineral.fracture: Uneven
Mineral.mohs: 3
Mineral.luster: Metallic
Mineral.streak: Black

via Wikipedia infobox

Wikidata facts

Subclass of: sulfide class of minerals
Has part: copper selenide
Image: Umangite-Clausthalite-202047.jpg

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Nickel-Strunz 9th edition (updated 2009): 2.BA.15c
Commons category: Umangite
chemical formula: Cu₃Se₂
Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 2.BA.25
crystal system: tetragonal crystal system
streak color: black
IMA Mineral Symbol: Um
Strunz 8th edition (series ID, updated): II/A.02 – Anhang

Sources (1)

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Encyclopedic overview

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References

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.

Excerpted from Wikipedia’s “umangite” article, available under the CC BY-SA 4.0 licence.