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. Example: Copper diselenide can occur both as a marcasite and a pyrite.
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