Formula: KFe4(AsO4)3(OH)4.6-7H2O
Origin of name: from Greek for poison and iron
Crystal system: cubic
Crystal class: -43m
Twinning:
Unit cell: a = 15.96 Å
Colour: olive-green to emerald-green, amber to dark brown
Diaphaneity:
Luster: adamantine to greasy
Habit: crystals cubes, faces striated diagonally, or tetrahedral, granular or earthy
Hardness: 2.5
Specific gravity: 2.79
Cleavage: 1; {100} imperfect to good
Tenacity: uneven, somewhat sectile
Streak:
Synonyms/varieties:
Comments:
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