porphyritic

Of or containing porphyry.

Containing relatively large isolated crystals in a mass of fine texture.

Containing or resembling porphyry; composed of a compact homogeneous rock in which distinct crystals or grains of feldspar or some other minerals are embedded: as, porphyritic granite. Also porphyraceous, and sometimes, incorrectly, porphyroid.

Relating to, or resembling, porphyry, that is, characterized by the presence of distinct crystals, as of feldspar, quartz, or augite, in a relatively fine-grained base, often aphanitic or cryptocrystalline.

of or pertaining to porphyry

containing large crystals in a fine mass of material

(of rocks) consisting of porphyry or containing large crystals in a fine groundmass of minerals