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The colour of sphalerite is white nearly colourless when pure, whereas sphalerite with high Fe content is almost black in colour. Besides a minor amount of cadmium and manganese is contained in addition to iron. The present writer has carried out some quantitative studies on the colour of sphalerite, especially in connection between the chemical components and whiteness. The whiteness in colour of sphalerite in which Fe ion substituting for Zn ion, decreases from 72% to 12% straightly, as the Fe content increases from 0% to 15%.