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As examples of such useful materials mention may be made of aluminum magnesium silicates such as attapulgites, such as "Pharmasorb" trade name of Englehard Minerals and Chemicals Corporation for an activated attapulgite typically containing about 67.0% silicon dioxide, 12.5% aluminum oxide, 11.0% magnesium oxide, 4.0% ferric oxide, 2.5% calcium oxide and 3.0% others; "Mineral Colloid BP" trade name of Georgia Kaolin Company for a highly refined montmorillonite, a naturally occurring colloid, light amber in color, fine thin flakes or microgranules, insoluble in water and organic solvents but dispersing in water to form a colloidal suspension, pH around 8.5-9.5, typically containing about 58.2% silicon dioxide, 23.1% aluminum oxide, 4.0% ferric oxide, 2.5% magnesium oxide and other oxides; "Astra-tone 40" trade name of Georgia Kaolin Company for an organic-modified montmorillonite, a light buff powder; "Gelwhite L" trade name of Georgia Kaolin Company for a white montmorillonite with very low iron content, calcium and sodium being the major exchangeable cations, microgranular in form, insoluble in water and organic solvents but dispersing easily in water to form a colloidal suspension, pH about 8.5-9.5, typically containing 60.8% silicon dioxide, 21.5% aluminum oxide, 3.62% magnesium oxide, 0.9% ferric oxide, 2.21% calcium oxide, 1.30% sodium oxide, as well as other compounds; "Gelwhite GP" trade name of Georgia Kaolin Company for a white purified colloidal montmorillonite with predominantly sodium ions in exchange positions, dispersing readily in water to form a translucent gel, pH about 9.5-10, typical chemical analysis indicating 58.6% silicon dioxide, 21.2% aluminum oxide, 4.07% sodium oxide, 3.79% magnesium oxide, 2.42% calcium oxide, 0.97% ferric oxide, as well as other compounds; and "Bentolite" trade name of Georgia Kaolin Company for a white bentonite treated to eliminate the major portion of iron and other color producing impurities, e.g., "Bentolite L", pH about 7, a white powder typically containing 71.65% silicon dioxide, 15.67% aluminum oxide, 3.64% magnesium oxide, 1.66% calcium oxide, 0.34% ferric oxide, as well as other oxides, "Bentolite L- 2", a white powder, pH about 7.0, typically containing about 71.53% silicon dioxide, 15.39% aluminum oxide, 3.63% magnesium oxide, 1.66% calcium oxide, 0.72% ferric oxide, as well as other oxides, and "Bentolite H", a white powder, pH about 9.5, typically containing 69.20% silicon dioxide, 14.50% aluminum oxide, 3.35% magnesium oxide, 1.05% calcium oxide, 0.66% ferric oxide, as well as other oxides; synthetic clays such as "Barasym - SMM -- Na+ " trade name of National Lead Company, Baroid Division, for a synthetic muscovite - mica - interstratified montmorillonite with sodium surface charge, "Barasym - SMM -- K+ " trade name of National Lead Company, Baroid Division, for a synthetic muscovite - mica - interstratified montmorillonite with potassium surface charge, "Saponite" trade name of National Lead Company, Baroid Division, for a synthetic magnesium aluminum silicate clay, "Lithium Synthetic Hectorite SMH-3" trade name of National Lead Company, Baroid Division, for a synthetic magnesium fluorosilicate polymer with lithium hydroxide surface hectorite clay, "Sodium Synthetic Hectorite MSL-306" trade name of National Lead Company, Baroid Division, for a synthetic magnesium fluorosilicate polymer with sodium hydroxide surface hectorite clay, etc.
