Abstract
Clays consist predominantly of hydrated silicates of alumina. The formulais frequently assumed to be Al2O3 * 2Si02*2H20, and certain of I. North Carolina. Low plasticity. II. Same as I, after washing. Low plasticity. III.Tennessee. Good plasticity. IV. Pennsylvania flint fireclay. Low plasticity. V. Laredo, Texas. Very plastic. CaO/Na2O corrected for COa. VI. San Antonio, Texas. Fine grained, highly plastic. Moisture and COawere determined together at 18.8 per cent. VII. Selected crude bentonite, California. them undoubtedly have substantially this composition, but in general the ratioof silica to alumina is considerably higher. However, they always contain waterof chemical constitution, as shown by Table 1.
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