Porphyritic

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Porphyritic \Por`phy*rit"ic\, a. [Cf. F. porphyritique.] (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.
     [1913 Webster]



From WordNet (r) 2.0 [wn]:

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