| 单词 | quartz slate |
| 释义 | > as lemmasquartz slate quartz slate n. ΚΠ 1824 H. E. Lloyd tr. J. B. von Spix & C. F. P. von Martius Trav. Brazil II. iv. 204 (note) Strictly speaking, Mr. Eschwege's itacolumite..should be called quartz-slate [Ger. Quarzschiefer]. 1896 Amer. Naturalist 30 394 The Sioux quartzites..grade upward into variously colored quartz slates that are composed of quartz grains, iron oxides and mica. 1945 Proc. Amer. Philos. Soc. 89 131/2 Transitional between the quartz slates and the biotite schists are phyllites in which oriented sericite accounts for the noticeable foliation. < as lemmas |
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