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单词 rock soap
释义

> as lemmas

rock soap
rock soap n. (a) Mineralogy (now historical) any of certain earthy clay minerals with a greasy texture, esp. halloysite; (also) †steatite (obsolete); (b) (in soap making) = sense 5e (obsolete).
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the world > the earth > structure of the earth > constituent materials > clay > [noun] > bole > type of
terra chia1615
Turkey earth1748
yellow earth1794
rock soap1803
1803 Gazetteer Scotl. at Hamilton There are several beds of steatites, or rock-soap.
1852 Rep. Juries Exhib. 1851 II. xxix. 1377 The lime decomposes the tallow and combines with the resulting stearic, margaric and oleic acids, forming a lime-soap (rock soap).
1854 J. D. Dana Syst. Mineral. (ed. 4) I. iv. 252 Rock soap, (Bergseife), Bolus of Sinope, and Ochran of Orawitza, are of similar character.
1883 Amer. Naturalist 17 872 Massive varieties of mesolite and of thomsonite, the latter sometimes called ‘rock soap’, are also described.
1901 G. P. Merrill in Ann. Rep. Board of Regents Smithsonian Inst. 1899 ii. 347 A rock soap from Ventura County, California, has been described..as a mixture of sandy and clayey or soapy material in the proportion of 45 per cent of the first and 55 per cent of the second.
1998 W. Bright Gudde's Calif. Place Names (ed. 4) at Javon It [sc. a mining boom] was started in 1875 when HL Bickford began to work a ‘rock soap’ mine in the canyon.
extracted from rockn.1
rock soap
b. rock soap, a variety of bole.
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1883 Encycl. Brit. XVI. 425 Magnesian Silicates... Bole. Earthy, in nests and veins... Stolpenite, Rock Soap, Plinthite..are varieties.
extracted from soapn.1
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