Formula: Ag(Cd,Pb)(As,Sb)S3
Origin of name: derived from the conspicuous quadratic shape of the mineral
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell: a = 5.499, c = 33.91
Colour: Gray, reddish gray, brilliant bronze
Diaphaneity: Opaque to translucent
Luster: Submetallic
Habit: Tabular, as pseudohexagonal plates, microscopic, pseudomorphic after unknown mineral, consisting of fibers intimately mixed with pyrite
Hardness: 3
Specific gravity: 5.70
Cleavage: {001} perfect, {110} distinct
Tenacity: Flexible
Streak: Reddish brown
Synonyms/varieties:
Comments:
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