Formula: BiAsO4
Origin of name: for F.D. Roosevelt, American president
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: gray
Diaphaneity:
Luster: adamantine
Habit: thin botryoidal crusts
Hardness: 4 to 4.5
Specific gravity: 6.86
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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