Formula: Cu2O
Origin of name: From Latin for copper
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell: a = 4.270 Å
Colour: Red, brownish red, purplish red to almost black
Diaphaneity:
Luster: Adamantine to earthy
Habit: Crystals cubic, octahedral, or dodecahedral; hair-like forming wads or mats (Chalcotrichite); massive, compact, granular
Hardness: 3.5 to 4
Specific gravity: 6.14
Cleavage: 2; {111} interrupted, {001} rare
Tenacity: Brittle
Streak: Brownish red, shiny
Synonyms/varieties: Chalcotrichite (capillary var.)
Comments:
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