8 letters · 21 points in Scrabble
noun any igneous rock with crystals embedded in a finer groundmass of minerals
originFrom Old French porfire, from Ancient Greek πορφυρίτης λίθος (porphurítēs líthos, “purple stone”), from πορφύρα (porphúra, “purple-fish, purple dye”).
Etymology from Wiktionary, CC BY-SA 3.0