Chromium ore is a natural mineral formation (lumpy, dark grey in colour) containing chromium in such compounds and concentrations as to make its commercial exploitation technically feasible and economically expedient.
Chrome ore concentrate
Chrome ore is the common name for the mineral chromite, which is described in the technical literature as an iron chromium oxide. Chrome ore is mined and is used predominantly in the metallurgical industry.
Manganese ore
Manganese is a chemical element with the symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron.