| 单词 | calcareous tufa |
| 释义 | > as lemmascalcareous tufa b. calcareous earth = lime, chalk; calcareous spar = calc-spar n.; calcareous tufa = calc-tuff n. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [noun] > chalk or limestone chalkc893 caukc1440 calcareous earth1757 1757 W. Watson in Philos. Trans. 1756 (Royal Soc.) 49 896 Ten grains of calcarious earth. 1799 Med. & Physical Jrnl. 1 255 Chalk, or calcareous earth. 1816 Sir H. Davy in Faraday Exp. Res. 4 Calcareous tufas..found in every part of Italy. 1816 R. Jameson Treat. External Characters Minerals (ed. 2) 104 Hexahedron is a solid, having of six quadrilateral planes and eight angles. .. Examples, calcareous-spar and fluor-spar. calcareous tufa calcareous tufa n. ‘a porous or vesicular carbonate of lime, generally deposited near the sources and along the courses of calcareous springs’ (Page Handbk. Geol. Terms, 1865). Cf. tuff n. a.extracted from tufan.< as lemmas |
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