a very common brass-yellow mineral, iron disulfide, FeS2, with a metallic luster, burned to sulfur dioxide in the manufacture of sulfuric acid: chemically similar to marcasite, but crystallizing in the isometric system.
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Pyrite, pī′rīt, n. native iron disulphide of a pale-yellow colour and very hard—also Iron pyrites.
One was by striking a flint against a piece of pyrite of iron, the other by simply rubbing together two pieces of wood.
No spars are found accompanying the ore; iron pyrite is occasionally met with, and plumbago is found in the vicinity.
The mineral is harder than chalcocite, but less hard than pyrite, being easily scratched with a knife.
Pyrite consists of iron and sulphur; magnetite, hematite, and limonite are oxides of iron.