Formula: CrO(OH)
Origin of name: For S. Bracewell, mineralogist, British Guiana
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Deep red to black
Diaphaneity:
Luster:
Habit: Microcrystalline or massive
Hardness:
Specific gravity: 4.45 to 4.48
Cleavage: None
Tenacity:
Streak: Dark brown
Synonyms/varieties:
Comments: Trimorphous with grimaldiite and guyanaite
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