| 单词 | pitchstone porphyry |
| 释义 | > as lemmaspitchstone porphyry pitchstone porphyry n. Geology now rare a porphyritic pitchstone. ΚΠ 1799 R. Kirwan Geol. Ess. 180 Huge strata..as they contain abundance of quartz and felspar may be called pitchstone porphyry. 1839 Jrnl. Royal Geogr. Soc. 9 266 Near the mosque of Naháden was a mass of pitchstone porphyry hewn into a singular form, similar to that of a baptismal font. 1883 Chambers's Encycl. VII. 690 Crystals of felspar, quartz, or calcareous spar, disseminated through a base of greenstone, form a greenstone porphyry. In the same way, there are pitchstone porphyry, basaltic porphyry, claystone porphyry, etc. 1932 A. Johannsen Descr. Petrogr. Igneous Rocks II. 282 The porphyritic pitchstones, normal vitrophyres, are also called pitchstone-porphyries. < as lemmas |
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