(Malchus) a.d. c233–c304, Greek philosopher.

Porphyrean [pawr-feer-ee-uhn] , adjective
Porphyrian, adjective, noun
Porphyrianist, noun
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World English Dictionary
porphyry (ˈpɔːfɪrɪ)
n , pl -ries
1.  any igneous rock with large crystals embedded in a finer groundmass of minerals
2.  obsolete a reddish-purple rock consisting of large crystals of feldspar in a finer groundmass of feldspar, hornblende, etc
[C14 porfurie, from Late Latin porphyrītēs, from Greek porphuritēs (lithos) purple (stone), from porphuros purple]

Porphyry (ˈpɔːfɪrɪ)
original name Malchus. 232--305 ad, Greek Neo-Platonist philosopher, born in Syria; disciple and biographer of Plotinus

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"beautiful and valuable stone," 1395, from O.Fr. porfire, from L. porphyrites, a purple semi-precious stone quarried near Red Sea in Egypt, from Gk. porphyrites "like purple" (the stone's name in Gk.), from porphyra (n.) "purple."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
porphyry   (pôr'fə-rē)  Pronunciation Key 
An igneous rock containing the large crystals known as phenocrysts embedded in a fine-grained matrix.

porphyritic adjective (pôr'fə-rĭt'ĭk)
The American Heritage® Science Dictionary
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