calc-tuff

noun

1. tufa(def 1).

noun Geology.

1. Also called calcareous tufa, calc-tufa, calc-tuff. a porous limestone formed from calcium carbonate deposited by springs or the like.Compare travertine.
2. (not in technical use) tuff2.

noun

1. another name for tufa

noun

1. a soft porous rock consisting of calcium carbonate deposited from springs rich in limeAlso called: calc-tufa

n.

“a porous rock,” 1770, from Italian tufa “tufa, porous rock,” probably from Latin tufus, tophus “loose, porous volcanic rock,” said to be an Oscan-Umbrian loan-word.

1. A soft, friable, and porous sedimentary rock consisting of calcium carbonate and formed by the evaporation of water, especially at the mouth of a hot spring or on a drying lakebed. It is similar to, but harder than, travertine.