pyrite
Pyrite, also known as "fool's gold," is a common mineral with a shiny, metallic appearance that resembles gold. Chemically, it's iron sulfide (FeSâ‚‚), forming in cubic or layered crystals. While it can be mistaken for gold due to its metallic luster, pyrite is much more abundant and less valuable. It occurs naturally in many geological environments, including sedimentary, metamorphic, and igneous rocks. Historically, it was sometimes used in the production of sulfur and sulfuric acid. Despite its resemblance to gold, pyrite has little monetary value but is interesting for its crystalline structure and role in mineral formation.