Formula: Ca5(AsO4)3(OH)
Origin of name: For John Baum, American geologist
Crystal system: Hexagonal
Crystal class: 6/m
Twinning:
Unit cell:
Colour: White to colourless
Diaphaneity:
Luster: Vitreous
Habit: Massive, anhedral granular, grains to 8 mm
Hardness: 4.5
Specific gravity:
Cleavage: 1; {100} distinct
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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