Formula: (Ag,Cu)16Sb2S11
Origin of name: from Greek for many and base
Crystal system: monoclinic, pseudohexagonal
Crystal class: 2/m
Twinning: on {110} repeated
Unit cell: a = 26.17 Å, b = 15.11 Å, c = 23.89 Å, b = 90.0°
Colour: iron-black, dark ruby-red in thin splinters
Diaphaneity:
Luster: metallic
Habit: crystals thin tabular, pseudohexagonal or pseudorhombohedral, massive, compact
Hardness: 2 to 3
Specific gravity: 6.30
Cleavage: 1; { 001} imperfect
Tenacity: uneven, brittle
Streak: black
Synonyms/varieties:
Comments: series with pearceite
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