Formula: (Ca,Y)Cu6[(OH)6|(HAsO4,AsO4)|(AsO4)2].3H2O
Origin of name: For the type locality; Zálesí (formerly Valdek) uranium deposit, Javorník, Olomouc Region, Moravia (Maehren; Mähren), Czech Republic
Crystal system: Hexagonal
Crystal class: 6/m
Twinning:
Unit cell: a = 13.571 Ĺ, c = 5.88 Ĺ
Colour: Pale green, grass-green
Diaphaneity: Transparent
Luster: Vitreous, resinous
Habit: Fibrous, acicular, powdery
Hardness: 2-3
Specific gravity: 3.49
Cleavage:
Tenacity:
Streak: Greenish white
Synonyms/varieties:
Comments: Member of the mixite group. Oxidation product of chalcopyrite.
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