Formula: BiAsO4
Origin of name: From tetragonal and rooseveltite
Crystal system: Tetragonal
Crystal class: 4/m
Twinning:
Unit cell: a = 5.085, c = 11.69
Colour: White to yellowish white, pale yellowish
Diaphaneity: Translucent
Luster: Earthy
Habit: grains to 50 micron in powdery aggregates to 10 mm
Hardness: 2.5
Specific gravity: 7.64 calculated
Cleavage:
Tenacity:
Streak: White
Synonyms/varieties:
Comments: dimorphous with rooseveltite, soluble in cold HCl. Oxidation product found on fluorite-barite gange.
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