Search the Dictionary

ous stone formed by depositions from water, usually calcareous; -- called also calcareous tufa.

Pertaining to tufa; consisting of, or resembling, tufa.

See under Calcite.

An assembly room in dwelling of the Pueblo Indians. L. H. Morgan.

A jet of steam issuing from a fissure in the earth.

A variety of opal occuring in the cavities of volcanic tufa, in smooth and shining globular and botryoidal masses, having a pearly luster; -- so called from Fiora, in Ischia.

A cellular calc tufa, which in some places forms incrustations on the stems of plants, -- formerly supposed to have the quality of uniting fractured bones.

loose banded variety of calcite formed by deposition from lime-bearing waters; calcareous tufa; travertine. -- Ceraunian sinter, fulgurite. -- Siliceous sinter, a light cellular or fibrous opal; especially, geyserite (see Geyserite). It has often a pearly luster, and is then called pearl sinter.

A calcareous tufa, in part crystalline, occurring on a large scale as a shore deposit about the Quaternary lake basins of Nevada.

Tufa. See under Tufa, and Toph.

Calcareous tufa.

, amygdaloid, etc., but including also some kinds of diorite. Called also trap rock. Trap tufa, Trap tuff, a kind of fragmental rock made up of fragments and earthy materials from trap rocks.

A white to gray volcanic tufa, formed of decomposed trachytic cinders; -- sometimes used as a cement. Hence, a coarse sort of plaster or mortar, durable in water, and used to line cisterns and other reservoirs of water. [Formerly written also tarras, tarrace, terras.]

Same as Tufa.

Produced by a volcano, or, more generally, by igneous agencies; as, volcanic tufa.