Formula: CaHAsO4.2H2O
Origin of name: from Greek for poison
Crystal system: monoclinic
Crystal class: m
Twinning: common
Unit cell: a = 5.96 Å, b = 15.31 Å, c = 6.36 Å, b = 114.7°
Colour: colourless, white, gray
Diaphaneity:
Luster: vitreous, pearly on cleavage
Habit: crystals flattened or acicular, small, rare, in clusters, botryoidal, stalactitic
Hardness: 2 to 2.5
Specific gravity: 2.68 to 2.73
Cleavage: 1; {010} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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