PORPHYRY

porphyry, porphyritic rock

(noun) any igneous rock with crystals embedded in a finer groundmass of minerals

Source: WordNet® 3.1

Etymology

Noun

porphyry (countable and uncountable, plural porphyries)

(geology) a hard igneous rock consisting of large crystals in a fine-grained matrix

A purple-red rock of this kind.

Source: Wiktionary

Por"phy*ry, n.; pl. Porphyries. Etym: [F. porphyre, L. porphyrites, fr. Gr. Purple.] (Geol.)

Definition: 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. Porphyry shell (Zoöl.), a handsome marine gastropod shell (Oliva porphyria), having a dark red or brown polished surface, marked with light spots, like porphyry.

Source: Webster’s Unabridged Dictionary 1913 Edition

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