Any of various dark-coloured porphyritic (esp. basaltic) rocks. Later: spec. an altered basalt, esp. of Carboniferous or Permian age.
| 单词 | θ5757 |
| 释义 | the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > porphyrite rock > subdivision (5) melaphyre1824 Any of various dark-coloured porphyritic (esp. basaltic) rocks. Later: spec. an altered basalt, esp. of Carboniferous or Permian age. orthophyre1869 A porphyritic rock containing phenocrysts chiefly of orthoclase in a feldspathic groundmass. granophyre1882 (See quot. 1882.) vitrophyre1882 combining form on Greek models of Latin vitrum glass, used in a few terms, as vitro-ˈdentine n. the hard external layer of dentine in a tooth. ˈvitro… granite-porphyry1885 = granophyre, n. |
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