Formula: CaZn2(AsO4)2.H2O
Origin of name: for Prosper Williams, South African-Canadian mineral dealer
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: white, colourless
Diaphaneity:
Luster: vitreous to silky
Habit: crystals prismatic, in radiating sprays, sheaf-like subparallel aggregates
Hardness: 4.5
Specific gravity: 4.31
Cleavage: none
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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