porphyritic

[pawr-fuh-rit-ik]
adjective Petrology.
of, pertaining to, containing, or resembling porphyry, its texture, or its structure.

Origin:
1375–1425; late Middle English porphiritike < Medieval Latin porphyrīticus < Greek porphyrītikós of porphyry; see -ic

nonporphyritic, adjective
pseudoporphyritic, adjective
subporphyritic, adjective
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World English Dictionary
porphyritic (ˌpɔːfɪˈrɪtɪk)
 
adj
1.  (of rocks) having large crystals in a fine groundmass of minerals
2.  consisting of porphyry

Collins English Dictionary - Complete & Unabridged 10th Edition
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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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Two distinct crystal sizes would develop in this situation, producing a porphyritic texture.
Porphyritic rocks occur between the schists and the quartzites.
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