Formula: Pb19(Sb,As)20S49
Origin of name: Named for Henry Clifton Sorby (1826-1908), English chemist and the founder of metallography.
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 45.15, b = 8.292, c = 26.53, β = 113.417°
Colour: black, lead gray
Diaphaneity: opaque
Luster: metallic
Habit: crystals equant to thin tabular, elongated, often striated
Hardness: 3.5
Specific gravity: 5.52
Cleavage: 1; {001} perfect
Tenacity:
Streak: black
Synonyms/varieties:
Comments:
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