Mineral Information and Data:

Auricupride
Cu3Au [CNMNC approved formula]

Named after its composition of Au and Cu.

IMA status : Valid species (Pre-IMA 1950) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
01.01.02.01  
  (01) Native Elements
  (01.01) with metallic elements other than the platinum group
  (01.01.02) Auricupride Group
  
Nickel-Strunz
(10th edition) :
01.AA.10a
  (01) Elements
  (01.A) Metals and Intermetallic Alloys
  (01.AA) Copper-cupalite family
  
Crystal system: Cubic System
Point group (H-M): m3m (or 4/m 3 2/m) — hexoctahedral
Unit cell: a = 3.753(5) Å
Crystal Habit: Massive, as rims less than 100 μm, irregular patches, and platy aggregations.
  
Color: Yellow with a reddish tint; in reflected light, violet-rose.
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 3.5
Measured Density: 11.5 g/cm3
  
Geologic Setting: In serpentinites as the product of low-temperature ordering and unmixing of Au–Cu solid solution alloys (Karabash deposit, Russia); in reduction halos in Permian red beds (near Zurich, Switzerland).
Mineral Association: Gold, copper, other Au–Cu alloys
  

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