Formula: (Al,Y)Cu6(AsO4)3(OH)6 . 3H2O
Origin of name: For H. Goudey, American mining geologist
Crystal system: Hexagonal
Crystal class: 6 or 6/m
Twinning:
Unit cell: a = 13.47 Ǻ, c = 5.902 Ǻ
Colour: Yellow-green
Diaphaneity:
Luster:
Habit: Crystals hair-like, submicroscopic, in tufted aggregates or cross-fiber veinlets
Hardness: 3 to 4
Specific gravity: 3.50
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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