(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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). porphyry. Retrieved September 25, 2026, from http://smartdefine.org/porphyry/definitions/2047615 |
| Chicago | Webster's. 2011. "porphyry" http://smartdefine.org/porphyry/definitions/2047615 (accessed September 25, 2026). |
| Harvard | Webster's 2011, porphyry, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/porphyry/definitions/2047615>. |
| MLA | Webster's. "porphyry" 27 May 2011. Web. 25 September 2026. <http://smartdefine.org/porphyry/definitions/2047615> |