meaning of porphyry
1. A term used somewhat loosely to designate a rock consisting of a fine-grained base (usually feldspathic) through which crystals, as of feldspar or quartz, are disseminated. There are red, purple, and green varieties, which are highly esteemed as marbles.
2. any igneous rock with crystals embedded in a finer groundmass of minerals
Related Words
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