Umangite

(repeating unit)Cu3Se2IMA symbolUm[1]Strunz classification2.BA.15cCrystal systemTetragonalCrystal classScalenohedral (42m)
H-M symbol: (4 2m)Space groupP421mIdentificationFormula mass348.56 g/molColorRed, bluish red-blackCrystal habitMassive granularCleavageDistinct on [010] and [001]FractureUnevenMohs scale hardness3LusterMetallicStreakBlackDiaphaneityOpaqueSpecific gravity5.62–6.78References[2][3][4]

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

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Webmineral data
  3. ^ Mindat.org
  4. ^ Mineralienatlas


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