Pyrite group

The pyrite group of minerals is a set of compounds, each a disulfide of at least one metallic element. They are named for the most common of their kind, FeS₂, usually known as pyrite but sometimes emphasized as iron pyrite, and often informally called fool's gold for its history of being taken for high-grade gold ore.

Examples include:

• Cattierite (CoS₂), a cobalt compound
• Vaesite (NiS₂) (incorporating nickel), and sometimes found together with cattierite in the Democratic Republic of Congo, or with ores of chalcopyrite (CuFeS₂), and sometimes containing both copper and iron pyruites
• Pyrrhotite, pyrite compounds ranging from the magnetic FeS through nonmagnetic variants as much as 20% deficient in sulfur.