- a common mineral, iron disulfide, FeS2, chemically similar to pyrite but crystallizing in the orthorhombic system.
- any of the crystallized forms of iron pyrites, much used in the 18th century for ornaments.
- a specimen or ornament of this substance.
- a metallic pale yellow mineral consisting of iron sulphide in orthorhombic crystalline form used in jewellery. Formula: FeS 2
- a cut and polished form of steel or any white metal used for making jewellery
