1) Calc-tufa 2) Calcite rock 3) Cellular rock 4) Geyseral deposit 5) Hard volcanic rock 6) Lime spring deposit 7) Porous limestone 8) Rock 9) Rocklike lake deposit 10) Soft, porous rock 11) Stone 12) Volcano rock
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https://www.crosswordclues.com/clue/tufa
1) Tuff
Found on
https://www.crosswordclues.com/clue/tufa
the calcareous (chalky, containing calcium carbonate) and siliceous (flinty, containing silica) deposits of springs, lakes, or ground water; also a rock composed of compacted volcanic ash: in architectural terms, tufa refers to a rough facing stone applied to buildings to give a rustic look.
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http://faculty.bsc.edu/jtatter/glossary.html
rock made of fine volcanic detritus
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http://phrontistery.info/t.html
• A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria. • A soft or porous stone formed by depositions from water, usually calcareous; -- called also calcareous tufa.
Found on
http://thinkexist.com/dictionary/meaning/tufa/
Spongy or vesicular calcium carbonate deposited from spring, river or lake waters. Cf. travertine.
Found on
http://www.cancaver.ca/docs/glossary.htm
Cellular rock; porous limestone.
Found on
http://www.castlesontheweb.com/glossary.html
Cellular rock; porous limestone.
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http://www.encyclo.co.uk/local/20018
a very light sponge-like limestone formed in aireated springs, and used decoratively eg in grottos or where lightness is important eg at the top of domes. - see Stone/stonework
Found on
http://www.encyclo.co.uk/local/20935
Synonym of sinter: Mineral deposit formed by mineral-rich spring water which comes to the surface and loses its capacity to withhold the dissolved mineral, thereby depositing it and forming a growing mound. Sometimes misconceived as tuff.
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http://www.encyclo.co.uk/local/22291
Tufa (tuff or toph) is a soft white porous rock of calcium carbonate deposited from solution in spring water or percolating ground water. When compact it is called Travertine. Much of it is exceedingly light, and resembles petrified sponge. Tufa is extremely durable, and was extensively used by the Romans for the external facing of buildings, as at...
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http://www.probertencyclopaedia.com/browse/HT.HTM
Calcareous deposit from saturated limy waters.
Found on
http://www.selectstone.com/architectural-resources/stone-glossary/
[
n] - a soft porous rock consisting of calcium carbonate deposited from springs rich in lime
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http://www.webdictionary.co.uk/definition.php?query=tufa
A porous, white limestone formed under water when springs or rainwater carry dissolved calcium into lakes that have a high concentration of bicarbonate ions (found in baking soda). When the two solutions mix they form calcium carbonate, which precipitates (comes out of solution), creating tufa—which often accumulates into underwater towers or cru...
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https://academy.allaboutbirds.org/bird-academys-a-to-z-glossary-of-bird-ter
A type of limestone created when carbonate minerals precipitate out of ambient temperature water.
Found on
https://rockclimbingcentral.com/rock-climbing-glossary-217-climbing-terms-y
calc-tufa noun a soft porous rock consisting of calcium carbonate deposited from springs rich in lime
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https://www.encyclo.co.uk/local/20974
Soft, porous, limestone rock, white in colour, deposited from solution from carbonate-saturated ground water around hot springs and in caves. Undersea tufa columns, such as those in the Ikka Fjord in southwestern Greenland, that form over alkaline springs, can reach 20 m/65 ft in height and grow at about 50 cm/20 in per year. They provi...
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https://www.encyclo.co.uk/local/21221
see travertine .
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https://www.encyclo.co.uk/local/22327
The calcareous (chalking, containing calcium carbonate) and siliceous (flinty, containing silica) deposits of springs, lakes or ground water; also a rock composed of compacted volcanic ash.
Found on
https://www.encyclo.co.uk/local/22488
A fine grained, porous limestone formed by chemical precipitation, often around springs.
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https://www.encyclo.co.uk/local/23001
Also calleda porous limestone formed from calcium carbonate deposited by springs or the like. Cf. · (not in technical use) tuff&hasp;.
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https://www.infoplease.com/dictionary/tufa
No exact match found.
