calc-tufa

from WordNet (r) 3.0 (2006)

calc-tufa
    n 1: a soft porous rock consisting of calcium carbonate
         deposited from springs rich in lime [syn: {tufa}, {calc-
         tufa}]

from The Collaborative International Dictionary of English v.0.48

Calc-tufa \Calc"-tu`fa\, n. [G. kalk (l. calx) lime + E. tufa.]
   See under {Calcite}.
   [1913 Webster]

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