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calc-tuff

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calc-tuff
calc-tuff Min. (ˈkælkˈtʌf) [see calc-.] A porous deposit of carbonate of lime, formed by the waters of calcareous springs; calcareous tufa.1822 Mrs. Lowry Convers. Min. II. 265 Acidiferous Earthy Minerals..Calc-tuff. 1857 Page Adv. Text-bk. Geol. xx. (1876) 420 Calc-tuff..is an open, porous, and som... Oxford English Dictionary
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calcareous
calcareous, -ious, a. (kælˈkɛərɪəs) [f. L. calcāri-us of lime (f. calc-em + -ārius) + -ous. The spelling in -eous, which appeared about 1790, is erroneous, influenced by words in -eous, from L. -eus. The etymological sense of calcar-eous would be ‘of the nature of a spur’.] Of the nature of (carbona... Oxford English Dictionary
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