tu·fa /ˈtufə, ˈtju-/
凝灰岩;多孔凝灰岩
Tu·fa 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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tufa
n 1: a soft porous rock consisting of calcium carbonate deposited
from springs rich in lime [syn: calc-tufa]
2: hard volcanic rock composed of compacted volcanic ash [syn:
tuff]