Formula: CrO(OH)
Origin of name: For F. Grimaldi, American chemist
Crystal system: Hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell:
Colour: Deep red, red-brown
Diaphaneity:
Luster:
Habit: Crystals tabular, in tiny intergrowths
Hardness:
Specific gravity: 4.11
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Trimorphous with bracewellite and guyanaite
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