Hematite

A type of iron oxide mineral with the chemical formula Fe2O3. Hematite is one of the most important ores of iron. Hematite has an extremely variable appearance. Its luster can range from earthy to submetallic to metallic. Its color ranges include red to brown and black to gray to silver. It occurs in many forms. However, hematite has a range of colors, massive crystals can have a brownish-red color.