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Calc-Tufa

Calcareous tufa, a porous or spongy deposit of calcium carbonate found in calcareous mineral springs.

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

See also: Tufa

Calc-sinter (Sinter is an important category in german chemistry)
Term for a solid calcium carbonate deposit in a solution during or after the chemical reaction of precipitation. The deposit is found in caves, mineral springs and also - as a coating or even thick layer - in old aquaeducts or waterpipes. If it were more compacted (e.g. recrystallized) and deposited uniformly it could be called Travertine.

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