Formula: PbBi2(Se,S)3
Origin of name: from Greek for to broaden
Crystal system: hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell:
Colour: white, dark gray to black
Diaphaneity: opaque
Luster: metallic
Habit: thin plates or foliae, grains forming aggregates to 1.5 to 2 cm
Hardness: 2
Specific gravity: 7.98
Cleavage: 2; {0001} good, {10-11} fair
Tenacity:
Streak: black, shining
Synonyms/varieties:
Comments:
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