Definition of pyrites:

part of speech: noun plural

A mineral of a peculiar brass- yellow colour, striking fire with steel, called also sulphuret of iron; also applied to other metallicores containing a large portion of sulphur; copper pyrites, a combination of copper and sulphur, being the most common ore of copper; iron pyrites, a combination of iron and sulphur, one of the most abundant minerals in nature.

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Naturally pert. to; innate; natural. ...