tuff, a relatively soft, porous rock that is usually formed by the compaction and cementation of volcanic ash or dust. (The Italian term tufa is sometimes restricted to the soft, porous, sedimentary rock formed by the chemical deposition of calcite, or calcium carbonate, or silica from water as sinter.)
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07.08.2024 · The meaning of TUFF is a rock composed of the finer kinds of volcanic detritus usually fused together by heat.