Formula: Cu9S5
Origin of name: From Greek for two sexes, in reference to the presumed presence of both cuprous and cupric ions
Crystal system: Cubic
Crystal class: -3 2/m
Twinning:
Unit cell: a = 5.57 Å
Colour: Deep blue to black
Diaphaneity: Opaque
Luster: Submetallic
Habit: Crystals rare; massive
Hardness: 2.5 to 3
Specific gravity: 5.6
Cleavage: None
Tenacity: Conchoidal fracture; brittle
Streak:
Synonyms/varieties:
Comments: Found in hydrothermal copper deposits of primary and secondary origin. Formed under a wide range of conditions, reported from mafic intrusives, as an exhalation product and in pegmatites.
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