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Chromite

Chromite is a crystalline mineral composed primarily of iron(II) oxide and chromium(III) oxide compounds. It can be represented by the chemical formula of FeCr₂O₄. It is an oxide mineral belonging to the spinel group. Wikipedia
Crystal system: Isometric
Chemical formula: FeCr2O4
Category: Oxide minerals; Spinel group; Spinel structural group
Cleavage: None, parting may develop along
Color: Black to brownish black; brown to brownish black on thin edges in transmitted light
Crystal habit: Octahedral rare; massive to granular
Diaphaneity: Translucent to opaque