porphyritic Meaning, Definition & Usage

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

WordNet


Por`phy*rit"ic adjective
Etymology
Cf. F. porphyritique.
Definitions
  1. (Min.) 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.

Webster 1913