Webster's English Dictionary

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porphyry

porphyry \'po.r-f(*-)re-\ n [ME porfurie, fr. ML porphyrium, alter. of L 
   porphyrites, fr.] Gk porphyrite-s (lithos), lit., stone like purple, fr. 
   porphyra purple 1: a rock consisting of feldspar crystals embedded in a 
   compact dark red or  purple groundmass 2: an igneous rock of porphyritic 
   texture