| 单词 | mica-schist |
| 释义 | > as lemmasmica-schist mica-schist n. [after French micaschiste (1807); compare earlier mica-slate n.] Geology a foliated, crystalline, metamorphic rock composed of alternate layers of mica and quartz and easily split. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > other metamorphics quartzite1823 mica-schist1826 amphibolite1833 hornfels1854 phthanite1854 hornblendite1874 psammite1882 tourmaline-rock1882 tourmaline-schist1882 jasperoid1898 skarn1901 metagabbro1904 metabasite1907 verdite1908 rodingite1911 siallite1933 tonstein1961 greenlandite1981 1824 H. T. De la Beche tr. Sel. Geol. Mem. in Ann. des Mines Pref. p. x Micaschiste. (Mica Slate.) Essentially composed of an abundance of continuous mica and quartz. The structure slaty.] 1826 R. Mills Statistics S. Carolina 30 Mica-schiste. Talco-Mica Schiste. 1833 C. Lyell Princ. Geol. III. 237 The sterile mica-schist is barely covered with vegetation. 1876 Amer. Naturalist 10 386 The rocks in which the valley is formed are, for the most part, clay slates and gold-bearing mica schists, which are very much curved and twisted. 1939 A. G. Tansley Brit. Islands & their Vegetation viii. xxxix. 799 On the Scottish mountains the arctic-alpine chomophyte communities reach their greatest development in the corries of the mica-schists. 1988 P. Wayburn Adventuring in Alaska (rev. ed.) i. 11 Alaska's most ancient rocks are mica-schists that date back only six-hundred million years. < as lemmas |
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