Formula: Ir
Origin of name: From Latin Iridus, goddess of the rainbow
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell: a = 3.8394
Colour: Silver-white
Diaphaneity: Opaque
Luster: Metallic
Habit: Commonly rounded or angular cubic grains
Hardness: 6 to 7
Specific gravity: 22.42
Cleavage: None
Tenacity: Malleable
Streak: White
Synonyms/varieties:
Comments: Nonmagnetic
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