Formula: PbZn2(AsO4)2 . 2H2O
Origin of name: For Helmut Winkler, German mineralogist
Crystal system: Triclinic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Sky-blue
Diaphaneity:
Luster: Vitreous to resinous
Habit: Crystals prismatic
Hardness: 4.5
Specific gravity: 5.30
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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