porphyrite
noun
por·phy·rite
ˈpȯ(r)fəˌrīt
plural -s
1
: an Egyptian red porphyry
2
: a quartz-free porphyry whose feldspar is plagioclase
Word History
Etymology
Latin porphyrites purple colored stone, porphyry, from Greek porphyritēs (lithos), from porphyra purple + -itēs, adjective suffix