The meaning of Porphyry and additional information.

Porphyries(pl. ) of Porphyry

Porphyry(n.) 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.