Tufa Rock


Tufa rock is a chemical sedimentary rock. 

It is a very spectacular rock, composed of calcium carbonate which precipitates from calcium-rich lake or salt water, or hot springs.





It is a soft, porous rock, naturally white or creamy in colour but often strained red by iron oxide minerals.

The major minerals are calcite and silica, but aragonite can also occur.

 tufa rock
 By Tim Malabuyo via Flickr.com


It has a fine, crystalline texture and sometimes it can contain fossils.

 agron tufa
 By sandy.redding via Flickr.com

There is actually another version too - a silica-rich version.

 calcareous tufa
 By sandy.redding via Flickr.com


It forms when silica precipitates from geysers and hot springs.

 tufa planters
 By Steve Rotman via Flickr.com
 

It has a structure with cavities and hollow tubes.

 mono lake tufa
 By Brian W. Tobin via Flickr.com
 

The one that forms at geysers is called geyserite.

 tufa towers
 By Eric via Flickr.com
 

Geyserite is found in New Zealand, Iceland, and in Yellowstone National Park in the US.













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