The mineral pyrite or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula FeS2. Pyrite is the most abundant sulfide mineral. Pyrite's metallic luster and pale brass-yellow hue give it a superficial resemblance to gold. Pyrite is a wonderful shiny mineral that instantly wakes up any space. Raw pieces of pyrite usually form clusters, but stunning cubes and spheres are also available. You can also choose to wear pyrite in any form of jewelry—from beads and pendants to rings and bracelets. Pyrite carvings are increasingly popular, as well. Pyrite and gold can easily be distinguished. Gold is very soft and will bend or dent with pin pressure. Pyrite is brittle, and thin pieces will break with pin pressure. Gold leaves a yellow streak, while pyrite's streak is greenish black.