Attapulgite zeolitic

Fibrous zeolites (natrolite, scolecite, thomsonite, edingtonite) Fibrous clay minerals (attapulgite sepiolite)... 

The structure proposed by Bradley (1940) has three forms of water a zeolitic water, bound water (at the edges of the octahedral sheet), and structural hydroxyls. Using thermogravimetric curves, Caillere and Henin (1961a) attempted to measure the amount of these three types of water for several attapulgites (Table LV). The amount of bound water and hydroxyls differs considerably from that calculated on the basis of the ideal structure (column 5) and suggests there are more structural hydroxyls than proposed for the ideal structure. 

Many other materials, including synthetic aluminas, aluminum carbonates, aluminum silicates, magnesium silicates, various forms of attapulgite and sepiolite (81-83), alumina-pillared acid-activated montmorillonite (84), synthetic mica mont-morillonite, HY-zeolite, zirconium phosphate (85), mica, kaolin, and synthetic hectorite (86), have been evaluated for their ability to purify virgin fats and oils, but none were as good as acid-activated bentonite. 

The conditions necessary for artificial synthesis of smectites suggest the kind of natural environment in which these minerals will be found. This environment is alkaline as a result of restricted drainage and/or evaporative salt accumulation (see Chapter 8), so that the normally mobile alkaline and alkaline earth ions (Na, K, Ca, Mg) accumulate, along with silica. Neoformation of smectites from Na-rich saline water, and possibly illites from more K-rich water, is favored under these conditions. Other very silica-rich silicate minerals, such as attapulgites, sepiolites, and zeolites, are also known to fomi under these conditions. Less alkaline conditions may be necessary for Fe and Al-rich (dioctahedral) smectite formation, and a reducing environment may assist crystallization. 

Natural clay minerals kaoUnite, bentonite, attapulgite, montmorillonite, clarit, Fuller s earth, zeolites, synthetic clays or zeolites... 

There are many more minerals that could be discussed ranging from wollas-tonite, to attapulgite clays, or zeolites. Some mineral zeolites are fibrous asbestos types of crystals. Natrolite, Na2Al2Si30io-2H20, is called Fibrous Zeolite. Zeolites are used extensively in detergents, throughout the world, as a poor substitute for phosphates, but it is unlikely that synthetic zeolites will cause problems as an... 

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