Chromite ore Cr2o3 46% chrome ore for Iron and steel casting Chromite ore Cr2o3 46% chrome ore for Iron and steel casting Chromite ore, Originally from South Africa ,is a special kind of sand for casting , chromite sand is a natural spinel mainly composed of chromite , Chromite sand foundry used as a highly fireproof sharpener for moulds and cores. size:AFS40-45, AFS45-50, AFS50-55