Formula: Bi3(VO4,AsO4,PO4)2O(OH)
Origin of name: for Friedrich Schumacher, German mineralogist
Crystal system: triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: yellow to yellowish brown
Diaphaneity:
Luster: adamantine
Habit: crystals rare, tabular, smaller than 0.1 mm, in crusts
Hardness: 3
Specific gravity: 6.90
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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