The bentonite is a clay type, so denominated by an American geologist, that had discovered her near Fort Benton in the Wyoming (USA), really to remember the name of the place of recovery. The constituent principal, that is the conclusive factor for the ownerships of the clay is the mineral clayey "montmorillonite." In turn this name derives from the place in the south of France: Montmorillon where a specific was recovered giacime. In other words, the bentonite is a general name that refers to a rock that contains in effects, additionally to the "montmorillonite" what prevailing mineral, other mineral associates what at all, feldspato, limestone, quartz, pirite etc. The bentonite is originated from the alteration of volcanic ashes: it deals with a devetrificazione in watery environment with leaving of a part of the silice,  >> BENTONITE, PERLITE, AGRIBENT, OIKOSBENT, CALCE, IMPERMEABILIZZANTI, EDILIZIA, CELLULOSA, BIOCALCE, BIOEDILIZIA, PREMISCELATI, TRIVELLAZIONI, ENOLOGIA, LETTIERE PER GATTI, DETERGENZA, CATANIA, SIRACUSA, CALTANISSETTA, PALERMO, TRAPANI, SICILIA, CAMPANIA, CALABRIA, ITALIA