recorded since 1555, from Old French (=modern) pyrite (12c.), from Latin pyrites, from Ancient Greek πυρίτης λιθός (pyrites lithos) "stone of fire, flint" (so called because it glitters), notably the first part: adjective πυρίτης (puritēs, “of or in fire”), from πῦρ (pur, “fire”)
pyrite (plural pyrites)
- (mineralogy) The common mineral iron disulfide (FeS2), of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system.
- (usually as a plural: pyrites) Any metallic-looking sulphide, such as the above, which is the most common.
- (solid state chemistry) (usually as a plural: pyrites) Any metal dichalcogenide that is isostructural to the common mineral.
- Copper diselenide can occur both as a marcasite and a pyrite.
- fool's gold
- iron pyrites