porphyry

noun
por·phy·ry | \ ˈpȯr-f(ə-)rē \
plural porphyries

Definition of porphyry 

1 : a rock consisting of feldspar crystals embedded in a compact dark red or purple groundmass

2 : an igneous rock of porphyritic texture

First Known Use of porphyry

15th century, in the meaning defined at sense 1

History and Etymology for 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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The first known use of porphyry was in the 15th century

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