Formula: Sb2S2O
Origin of name: From kermes, an old chemical name for antimony trisulfide
Crystal system: Monoclinic
Crystal class: -1
Twinning:
Unit cell: a = 10.78 Ǻ, b = 4.07 Ǻ, c = 10.21 Ǻ, β = 101.5°
Colour: Cherry-red
Diaphaneity:
Luster: Adamantine
Habit: Crystals lath-shaped; radiating aggregates; hair-like
Hardness: 1 to 1.5
Specific gravity: 4.68
Cleavage: 2; {001} perfect, {100} distinct
Tenacity: Sectile, thin laminae flexible
Streak: Brownish red
Synonyms/varieties:
Comments:
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