Tuff, Volcanic Ash, Igneous Rock & Pyroclastic Material

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

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Close-up of the massive Tuff IF pyroclastic flow deposit at Loc

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