Formula: MoO3.2H2O
Origin of name: for Sidney Williams, American mineralogist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: bright yellow
Diaphaneity:
Luster: resinous
Habit: crystals tabular, to 0.2 mm
Hardness: 2.5
Specific gravity: 3.12
Cleavage: 1; {010} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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