Formula: MgCr2O4
Origin of name: From magnesium and chromite
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: Black
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals octahedral, rare; massive ,compact to fine granular
Hardness: 5.5
Specific gravity: 4.20
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with chromite and with spinel; sometimes weakly magnetic
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