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pyrite (n.)

"metallic iron disulfide," occurring naturally in cubes and crystals, "fool's gold," 1550s, from Old French pyrite (12c.), from Latin pyrites, from Greek pyritēs lithos "stone of fire, flint" (so called because it glitters), from pyritēs "of or in fire," from pyr (genitive pyros) "fire" (from PIE root *paewr- "fire"). Related: Pyritic.

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Definitions of pyrite

pyrite (n.)
a common mineral (iron disulfide) that has a pale yellow color;
Synonyms: iron pyrite / fool's gold
From wordnet.princeton.edu