Cuproiridsite

Formula:  CuIr₂S₄

Origin of name:  From copper and iridium

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning:

Unit cell: a = 9.92 Å

Colour:  Iron-black

Diaphaneity: Opaque

Luster:  Metallic

Habit:  Microscopic (300 microns) inclusions in isoferroplatinum

Hardness:

Specific gravity:  7.24

Cleavage:  None

Tenacity: Very brittle

Streak:

Synonyms/varieties:

Comments:  Series with cuprorhodsite and with malanite. Found in alluvial deposits