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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.
By Tim Malabuyo via Flickr.com
It has a fine, crystalline texture and sometimes it can contain fossils.
By sandy.redding via Flickr.com
There is actually another version too - a silica-rich version.
By sandy.redding via Flickr.com
It forms when silica precipitates from geysers and hot springs.
By Steve Rotman via Flickr.com
It has a structure with cavities and hollow tubes.
By Brian W. Tobin via Flickr.com
The one that forms at geysers is called geyserite.
By Eric via Flickr.com
Geyserite is found in New Zealand, Iceland, and in Yellowstone National Park in the US.
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