Peperino is 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, and other similar minerals. The typical peperino occurs in the Alban Hills and in Soriano nel Cimino, near Rome, and was used by the ancients, under the name of lapis al...
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http://en.wikipedia.org/wiki/Peperino
• (n.) A volcanic rock, formed by the cementing together of sand, scoria, cinders, etc.
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http://thinkexist.com/dictionary/meaning/peperino/
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