A soft or porous stone formed by depositions from water, usually calcareous; -- called also calcareous tufa.
A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria.
Calcareous deposits found in eerie rock forms at Mono Lake.
a porous rock formed as deposits in underground streams or springs. Strong and brittle, was preferred for the digging of burial chambers
A porous rock formed from deposits of springs.
A hot spring deposit of calcite travertine.
also known as travertine, this rock formation occurs when dissolved calcium carbonate precipitates out of solution. This is similar to the process that creates flowstone, and stalagmites and stalactites.
Common Roman Building stone. Volcanic with a coarse, porous texture.
Abbreviation for hypertufa.
Naturally occurring soft or porus rock formed by water deposits. Tufa rock is artifically reproduced with hypertufa.
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.
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.
Cellular rock; porous limestone.
A chemical sedimentary rock composed of calcium carbonate, formed by evaporation as an incrustation around the mouth of a spring or along a stream. It can also form a thick concretionary deposit in a lake or along its shore, as is the case of the Mono Lake Tufa.
a soft porous rock consisting of calcium carbonate deposited from springs rich in lime
hard volcanic rock composed of compacted volcanic ash
a soft volcanic rock which hardens on contact with air
Deposit or precipitate of calcium carbonate around calcareous springs
(soil): A porous, calcareous rock, often found around mineral springs.
A soft volcanic stone, used in making grottos. - DEFINITIONS Return to glossary index
or Tufo: A variety of travertine, which is extremely porous.
soft stone composed of compacted volcanic ash
A spongy form of calcium carbonate created by evaporation around springs or from a lake surface.
Porous rock composed of calcium carbonate.
any of various porous rocks formed of powdery matter consolidated and often stratified, especially a form of limestone deposited by springs, lakes, etc. [AHDOS
Tufa is the name for an unusual geological form of calcite rock.