tufa

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tufa:

see travertinetravertine
, form of massive calcium carbonate, CaCO3, resulting from deposition by springs or rivers. It is often beautifully colored and banded as a result of the presence of iron compounds or other (e.g., organic) impurities.
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tufa

[′tü·fə]
(geology)
A spongy, porous limestone formed by precipitation from evaporating spring and river waters, often onto leaves and stems of neighboring plants. Also known as calcareous sinter; calcareous tufa.

tufa

A porous limestone used in masonry construction.

tufa

a soft porous rock consisting of calcium carbonate deposited from springs rich in lime