Arcubisite

Formula:  Ag₆CuBiS₄

Origin of name:  Combination of major metallic element symbols: ARgentum (silver), CUprum (copper) and BISmuth

Crystal system:  Unknown

Crystal class:  Unknown

Twinning:

Unit cell:

Colour:  Light grey with a faint olive-brown tint in reflected light

Diaphaneity: Opaque

Luster:  Metallic

Habit:  Microscopic grains, about 0.05 mm

Hardness:

Specific gravity:

Cleavage:  None

Tenacity:

Streak:

Synonyms/varieties:

Comments:  Observed in polished section only. Found in a cryolite deposit (Ivigut, southern Greenland)