porphyry

Rock containing relatively large conspicuous crystals, especially feldspar, in a fine-grained igneous matrix.

In ceramics, a hard colored body made by Josiah Wedgwood, in imitation of porphyry.

The English form of the Latin word porphyrites, used by the Romans to designate a certain rock having a dark-crimson ground through which are scattered small crystals of feldspar.

A slab of porphyry, used in alchemy.

In zoology, a porphyry-moth.

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.

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

a hard igneous rock consisting of large crystals in a fine–grained matrix

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