Formula: Cu3(AsO4)(OH)3
Origin of name: From Greek for to slant and to break
Crystal class: 2/m
Unit cell: a = 12.41Ǻ, b = 6.47 Ǻ, c = 7.27 Ǻ, β = 99.6°
Colour: Dark greenish blue to greenish black
Diaphaneity:
Luster: Vitreous, pearly on cleavage
Habit: Crystals elongated, tabular; rhombohedral; isolated crystals, druses or rosettes
Hardness: 2.5 to 3
Specific gravity: 4.33
Cleavage: 1; {001} perfect
Streak: Bluish green
Synonyms/varieties:
Comments:
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