Tufa
Porous limestone rock formed when carbonate minerals precipitate out of ambient temperature water / From Wikipedia, the free encyclopedia
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Not to be confused with tuff, a porous volcanic rock also called 'tufa'.
For other uses, see Tufa (disambiguation).
Tufa is a variety of limestone formed when carbonate minerals precipitate out of water in unheated rivers or lakes. Geothermally heated hot springs sometimes produce similar (but less porous) carbonate deposits, which are known as travertine. Tufa is sometimes referred to as (meteogene) travertine.[1] It should not be confused with hot spring (thermogene) travertine. Tufa, which is calcareous, should also not be confused with tuff, a porous volcanic rock with a similar etymology that is sometimes also called "tufa".