(1) A common mineral (iron disulfide) that has a pale yellow color
recorded since 1555, from (=modern) pyrite (12c.), from pyrites, from πυρίτης λιθός (pyrites lithos) "stone of fire, flint" (so called because it glitters), notably the first part: adjective <
- 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
- (usually as a plural: pyrites) Any metal dichalcogenide that is isostructural to the common mineral
- Copper diselenide can occur both as a marcassite and a pyrite.