Tu"fa (?), [It. fufo soft, sandy stone, L. tofus, tophus. Cf.
Tofus, Toph, and Tophin.]
(Min.) (a) A soft or porous stone formed by depositions from water, usually calcareous; -- called also
calcareous tufa. (b)
A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria.
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