cu zn pb plant gold ore chromite Chromite Cr occurs exclusively in mafic and ultramafic igneous rocks Papp and Lipin 2006.Although some Crbased minerals such as crocoite PbCrO 4 vauquelinite Pb 2 Cu CrO 4 PO 4 uvarovite Ca 3 Cr 2 SiO 4 3 and merumite 4 CrAl 2 O 3 ܩH 2 O are well known chromite FeCr 2 O 4 is the only one that is a commercially
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