Formula: FeV2O4
Origin of name: For Arthur Coulson, Indian Geological Survey
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: Bluish gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals subhedral, microscopic
Hardness: 4.5 to 5
Specific gravity: 5.17 to 5.20
Cleavage: None
Tenacity:
Streak: Dark brown to black
Synonyms/varieties:
Comments:
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