porphyritic

adjective

por·​phy·​rit·​ic ˌpȯr-fə-ˈri-tik 

1

: of or relating to porphyry

2

: having distinct crystals (as of feldspar) in a relatively fine-grained base

Word History

Etymology

Middle English porphiritike, from Medieval Latin porphyriticus, from Greek porphyritikos, from porphyritēs (lithos) porphyry

First Known Use

15th century, in the meaning defined at sense 1