Bronzite is a rich chocolate brown with metallic areas that have a distinct golden-bronze luster. It is a mineral that contains iron and magnesium. Gemologists refer to the shimmering quality of this stone as chatoyancy - an optical reflectance that looks like a silky sheen. Technically, chatoyancy comes either from the fibrous structure of the material or from fibrous inclusions or cavities within the stone. Bronzite deposits are found in Burma, Brazil, Kenya, India, Mexico, Sri Lanka, South Africa, Tanzania and the United States.