Formula: Cr O (OH)
Origin of name: Locality; Guyana
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Reddish brown, golden brown, greenish brown
Diaphaneity:
Luster:
Habit: Massive, Microcrystalline
Hardness:
Specific gravity: 4.53
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Trimorphous with bracewellite and grimaldiite
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