Pyrite, a sulfide mineral commonly known as fool's gold, has various uses. It can be used to make iron sulfate, which has applications such as nutritional supplements, ink, lawn conditioner, water treatment, and moss killer. Some people also use pyrite in its original form for cabbing, wire wrapping, tumbling, or as decorative rocks. Additionally, pyrite can be used to start a fire by striking two pyrite rocks together or with flint.