What is Tufa?
[[Image:Mono lake tufa.JPG|thumb|Tufa columns at [[Mono Lake]], [[California]].]] '''Tufa''' is a [[wikt:porous|porous]] variety of [[limestone]]. It is formed by the [[precipitation]] of [[carbonate]] [[mineral]]s from water at normal temperatures. [[Geothermal energy|Geothermally]] heated [[hot spring]]s sometimes produce similar (but less porous) carbonate deposits known as [[travertine]]. Do not confuse with the rock made of [[volcanic ash]], which is called [[tuff]]. {{sci-stub}} [[Category:Carbonate rocks]] [[Category:Sedimentary rocks]]