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General Information
Category: Oxide minerals (Spinel group)
Formula: (Fe, Mg)Cr2O4
Crystal system: Isometric
Crystal class: Hexoctahedral (m3m)
Properties
It is dark gray to black in color with a metallic to submetallic luster and a high specific gravity. It occurs in basic and ultrabasic igneous rocks and in the metamorphic and sedimentary rocks that are produced when chromite-bearing rocks are altered by heat or weathering.