Mineral Information and Data:

Arcubisite
Ag6CuBiS4 [CNMNC approved formula]

Named for the composition (ARgentum, CUprum, and BISmuth).

IMA status : Approved Species 1976 (IMA1973-009)
CLASSIFICATION 
Dana
(8th edition) :
03.02.06.01  
  (03) Sulfides - Sulfosalts
  (03.02) where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.02.06)
  
Nickel-Strunz
(10th edition) :
02.LA.40
  (02) Sulfides
  (02.L) Unclassified Sulfosalts
  (02.LA) Without essential Pb
  
Crystal system: Orthorhombic System
Point group (H-M): Unknown — Unk
Crystal Habit: Microscopic grains, about 0.05 mm
  
Color: Light grey with a faint olive-brown tint in reflected light
Diaphaneity: Opaque
Luster: Metallic
  
Geologic Setting: In a cryolite deposit.
Mineral Association: Galena, hessite, aikinite, matildite, berryite, tellurian canfieldite, acanthite, bismuth, quartz, fluorite, cryolite
  

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