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chromite




chromite
Chromite
Image source: Mineral Information Institute

A hard black spinel mineral, an iron (II) chromium (III) mixed oxide (FeO.Cr2O3); it is the only important ore of chromium. Chromite separates from magma when igneous rocks first form, occurring as octahedral crystals and as granular masses. It is weakly magnetic and opaque. The vast majority of the world's chromite is found in South Africa and Zimbabwe. Hardness 5.5, relative density 4.6.


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   • GEOLOGY AND PLANETARY SCIENCE