porphyry

noun por·phy·ry \ ˈpȯr-f(ə-)rē \

Definition of porphyry

plural porphyries
1 :a rock consisting of feldspar crystals embedded in a compact dark red or purple groundmass
2 :an igneous rock of porphyritic texture

Origin and Etymology of porphyry

Middle English porphiri, from Medieval Latin porphyrium, alteration of Latin porphyrites, from Greek porphyritēs (lithos), literally, stone like Tyrian purple, from porphyra purple


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