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  • See the Cent. Dict. definition for tuff, which reads, in part, as follows: "The tufo of the Italians, at the present time, is volcanic, and is the same rock which was designated by the Romans as lapis ruber; it closely resembles peperino (the lapis Albanus of the Romans), and does not differ, except in color and degree of compactness from the modern sperone (lapis Gabium), or from the socalled manziana (lapis Anitianus)."

    August 9, 2011