Formula: Ca4Mn3-x(BO3)3(CO3)(O,OH)3
Origin of name: For C. Gaudefroy, French mineralogist
Crystal system: Hexagonal
Crystal class: 6
Twinning:
Unit cell: a = 10.6 Ǻ, c = 5.90 Ǻ
Colour: Black
Diaphaneity:
Luster: Brilliant to dull
Habit: Hexagonal prisms, acicular to stubby
Hardness: 6
Specific gravity: 3.35 to 3.50
Cleavage: None
Tenacity: Conchoidal; brittle
Streak:
Synonyms/varieties:
Comments:
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