Tuff, Volcanic Ash, Igneous Rock & Pyroclastic Material
By A Mystery Man Writer
Description
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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Well-preserved fallout basaltic tuff in central Paraná-Etendeka
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