| 单词 | porphyry |
| 释义 | porphyry /pawr"feuh ree/, n. , pl. porphyries. 1. a very hard rock, anciently quarried in Egypt, having a dark, purplish-red groundmass containing small crystals of feldspar. 2. Petrol. any igneous rock containing coarse crystals, as phenocrysts, in a finer-grained groundmass. [1350-1400; ME porfurie, porfirie < ML porphyreum, alter. of L porphyrites < Gk porphyrítes porphyry, short for porphyrítes líthos porphyritic (i.e., purplish) stone, equiv. to pórphyr(os) PURPLE + -ites; see -ITE1] |
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