Rock containing fairly large conspicuous crystals, specially feldspar, in a fine-grained igneous matrix.
a tough igneous rock comprising huge crystals in a fine-grained matrix
A term used significantly loosely to designate a rock composed of a fine-grained base (usually feldspathic) by which crystals, as of feldspar or quartz, tend to be disseminated. There are red, purple, and green types, that are extremely esteemed as marbles.
The English as a type of the Latin term porphyrites, employed by the Romans to designate a certain stone having a dark-crimson ground through which are scattered little crystals of feldspar.
A slab of porphyry, utilized in alchemy.
In zoology, a porphyry-moth.
In ceramics, a hard colored body created by Josiah Wedgwood, in replica of porphyry.
any igneous rock with crystals embedded in a finer groundmass of minerals