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Check the listing for details. tuff breccia - welded volcanic ash with angular clasts - unit of 5 specimens. Listed at 4.60 USD. Tuffs are light colored, usually shades of buff or gray, and since they are silica rich, they are not dense. This pink tuff is spectacular, in part because of the varied clasts. A student should know that angular clasts, from the Greek klastos for broken in pieces, are characteristic of tuffs.