Nichromite
General Information: Chemical Formula:(Ni,Co,Fe++)(Cr,Fe+++,Al)2O4 IMA Status:Approved IMA 1978 Physical Properties: Cleavage:[???] Indistinct Color:black. Density:5.24 Diaphaniety:Opaque Hardness:6-6.5 - Orthoclase-Pyrite Luster:Metallic Streak:greenish gray More details...
(Ni,Co,Fe)(Cr,Fe,Al)2O4
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