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porphyrite

noun
por·​phy·​rite | \ ˈpȯ(r)fəˌrīt\
plural -s

Definition of porphyrite

1 : an Egyptian red porphyry
2 : a quartz-free porphyry whose feldspar is plagioclase

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History and Etymology for porphyrite

Latin porphyrites purple colored stone, porphyry, from Greek porphyritēs (lithos), from porphyra purple + -itēs, adjective suffix

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