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calc-tufa
(kălkˈto͞oˌfə, -tyo͞oˌ-) also calc-tuff (-tŭfˌ)
noun Calcareous tufa, a porous or spongy deposit of calcium carbonate found in calcareous mineral springs.
(kălkˈto͞oˌfə, -tyo͞oˌ-) also calc-tuff (-tŭfˌ)
noun