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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 or thermogene travertine .
It is the dominant type of stone used in construction in Armenia's capital Yerevan, [61] [62] Gyumri, Armenia's second largest city, and Ani, the country's medieval capital, now in Turkey. [63] A small village in Armenia was renamed Tufashen (literally "village of tuff") in 1946.
Tufa and travertine sediments visible on the Una river bed. Tufa and travertine deposits on Krka National Park. In the United States, the most well-known place for travertine formation is Yellowstone National Park, where the geothermal areas are rich in travertine deposits. [52] Wyoming also has travertines in Hot Springs State Park in ...
Tuffeau stone — in French, simply tuffeau or tufeau — is a local limestone of the Loire Valley of France. It is characterized as a chalky or sandy, fine-grained limestone, white to yellowish-cream in appearance, and micaceous (containing some white flakes of mica , or muscovite ).
A hand-shaped planter made of hypertufa. Aggregates are generally Sphagnum (peat moss), sand, and perlite or vermiculite. [1] Coconut coir is coming to take the place of sphagnum moss, as the latter is a very slowly renewing natural resource and the former is a ready byproduct of the coconut industry— it has all the advantages of the moss but without the environmental costs.
The Trona Pinnacles are an unusual geological feature in the California Desert National Conservation Area. [1] The landscape consists of more than 500 tufa spires (porous rock formed as a deposit when springs interact with other bodies of water), some as high as 140 ft (43 m), rising from the bed of the Searles Lake (dry) basin.
Mono Lake Tufa State Natural Reserve is located near Yosemite National Park within Mono County, in eastern California. It was established in 1981 [ 2 ] by the California State Legislature to preserve the natural limestone " tufa tower " formations at Mono Lake .
The stone cladding on these bridges has overtime become unnaturally blackened. Geologists have speculated two different reasons for this. The first being that the coal dust that was abundant in Pittsburgh during the mid-twentieth century caused the darkening, and the second being that the darkening is a result of manganese oxidation . [ 10 ]
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