Clay coloured red by its iron content; spec. (a) soil with a high content of red clay; (b) a red or reddish-brown fine-grained deposit covering…
| 单词 | θ5956 |
| 释义 | the world > the earth > structure of the earth > constituent materials > clay > [noun] > other clays (23) red clayc1475 Clay coloured red by its iron content; spec. (a) soil with a high content of red clay; (b) a red or reddish-brown fine-grained deposit covering… urry1669 (See quots.) blae1724 A bluish grey indurated clay occurring in thin slaty strata. cat-dirt1747 a kind of clay. iron clay1750 Geology. Ironstone containing much clay. Also: clay rich in iron oxide. Frequently attributive. till1762 A term applied to a stiff clay, more or less impervious to water, usually occurring in unstratified deposits, and forming an ungenial subsoil… mulatto clay1788 a brown clay. oak-tree clay1794 either of two clay deposits of southern England: (a) = Kimmeridge clay n. at Kimmeridge, n.; (b) = weald clay n. at weald, n. compounds. porcelain jasper1794 a hardened clay or shale resulting from thermal metamorphism (originally regarded as a variety of jasper); cf. porcellanite, n. 1. porcellanite1794 Geology. Originally: a hardened clay or shale resulting from thermal metamorphism; also called porcelain jasper. Later also: any dense siliceous… Karoo ground1836 a yellowish iron-clay. plinthite1836 Mineralogy. A brick-red ferruginous clay. Obsolete. papa1851 A relatively soft, calcareous rock or clay, esp. a bluish clay found in the North Island of New Zealand. Also papa rock. Bradford clay1858 (see quots.). Indianaite1868 A very fine-grained clay found in Indiana which is white when in a pure form and consists of a hydrated variety of halloysite. sinopite1868 (See quots.) hydrobiotite1881 (a) a hydrated variety of biotite; (b) any clay composed of an intimate mixture of biotite and vermiculite. pampas-clay1885 a bluish South American clay deposit (see quot. 1885). byon1892 The ruby-bearing clay of the ruby mines district of Upper Burma (Myanmar); also attributive. potato clay1896 a variety of clay traditionally used by Hopi Indians (frequently mixed with water) to neutralize bitterness, acidity, or toxins in foods such as… bentonite1898 A clay found in the Fort Benton strata of the Cretaceous of Wyoming. Also, any of several clayey deposits containing montmorillonite which have… quick clay1901 a type of clay found in northern areas (e.g. Scandinavia, Canada) typified by a high water content, which under certain conditions can spontaneously… gumbotil1916 A leached grey clay, very sticky when wet and very hard when dry, found extensively in Iowa and neighbouring states. |
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