pyrite

A brass-colored mineral, FeS₂, occurring widely and used as an iron ore and in producing sulfur dioxide for sulfuric acid.

Native iron disulphid (FeS₂), a very common mineral, occurring in isometric crystals, cubes, octahedrons, pyritohedrons, etc., and also, and more often, massive.

A common mineral of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulphide.

The common mineral iron disulfide (FeS2), of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system.

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.

a common mineral (iron disulfide) that has a pale yellow color