tufa

Noun
  1. A soft porous rock consisting of calcium carbonate deposited from springs rich in lime (synset 114955461)
    is a type of: rock, stone - material consisting of the aggregate of minerals like those making up the Earth's crust
    same as: calc-tufa
  2. Hard volcanic rock composed of compacted volcanic ash (synset 114955350)
    is a type of: volcanic rock - extrusive igneous rock solidified near or on the surface of the Earth
    same as: tuff

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