Formula: Na2(Sb,As)8S13 . 2H2O
Origin of name: For James Gerstley, mining company executive
Crystal system: Monoclinic
Crystal class: m
Twinning:
Unit cell:
Colour: Dark red
Diaphaneity:
Luster: Adamantine (weakly)
Habit: Thick plates, in groups; fine granular aggregates, platy-fibrous spherules
Hardness: 2.5
Specific gravity: 3.62
Cleavage: 3; {010} and {100} perfect, {001} poor
Tenacity:
Streak: Bright cinnabar red
Synonyms/varieties:
Comments:
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