Formula: (Pb,Tl)2As5S9
Origin of name: For A. Hutchinson, English mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 10.80 Ǻ, b = 35.35 Ǻ, c = 8.16 Ǻ
Colour: Cherry red to almost black
Diaphaneity:
Luster: Adamantine
Habit: Crystals prismatic to acicular, radiating tufts
Hardness: 1.5 to 2
Specific gravity: 4.6
Cleavage: 1; {010} good
Tenacity: Conchoidal; brittle
Streak: Cherry-red
Synonyms/varieties:
Comments:
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