20 pyrite mineral specimens perfect for your rock tumbler Pyrite is a brass-yellow mineral and is the most common sulfide mineral. It occurs in high and low temperatures and forms in small quantities. The resemblance to gold is often why it is referred to as “fools gold”. A disappoint find for prospectors but for us, it’s amazing. The name Pyrite comes from the Greek word “pyr”, which means fire. This is because Pyrite creates sparks when it’s struck forcefully by iron. According the metaphysics, pyrite will help you reset the brain so that you will have new ways of thinking. Nothing foolish about that.