Formula: Pb3Mn(AsO3)2(AsO2OH)
Origin of name: from Greek for triangle
Crystal system: monoclinic
Crystal class: m
Twinning:
Unit cell:
Colour: yellow to brownish yellow to dark brown
Diaphaneity: translucent
Luster: vitreous to adamantine
Habit: crystals thick tabular, triangular outline, highly modified
Hardness: 2 to 3
Specific gravity: 6.1 to 7.1
Cleavage: 2; {010} perfect, {101}good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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