porphyritic Meaning, Definition & Usage
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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.Definitions
(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.