1911 Encyclopædia Britannica/Peperino
PEPERINO, an Italian name applied to a brown or grey volcanic tuff, containing fragments of basalt and limestone, with disseminated crystals of augite, mica, magnetite, leucite, &c. The typical peperino occurs in the Alban Hills, near Rome, and was used by the ancients, under the name of lapis albanus, as a building stone and for the basins of fountains. Other tuffs and conglomerates in Auvergne and elsewhere are also called peperino. The name originally referred to the dark coloured inclusions, suggestive of pepper-corns. In English the word has sometimes been written peperine.