Pyrite, or Iron Pyrites, a crystalline mineral containing iron and sulfur. It has a metallic luster and is pale yellow in color. When exposed to air, it tarnishes to a dull brown. Pyrite is sometimes called fool's gold because its color and luster cause it to be mistaken for gold. It is, however, harder and more brittle than gold.
Pyrite is a common mineral, found all over the world in many types of rocks. It is often found in metallic ores and is also present in some coal deposits. Pyrite is used as a source of sulfur, sulfur dioxide, and sulfuric acid.
Pyrite is iron disulfide, FeS2.