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KENTUCKY OM #4 BALL CLAYOld Mine #4 OM4 SiO2 55.2% Al2O3 27.9 Fe2O3 1.1 TiO2 1.2 MgO 0.4 CaO 0.3 K2O 1.0 Na2O 0.3 P2O5 SO3 L.O.I. 12.6 P.C.E. Cone 32 Geographical Source: Western Kentucky Geological Source: Sedimentary clay and volcanic ash material deposited by water; formed primarily during middle Eocene epoch approximately 46 million years ago Characteristics: Ball clays are fine-grained highly plastic clays containing a fair amount of carbonaceous organic matter. Ball clays are generally used in quantities of no more than 25% of the total constituents of a clay body due to their high shrinkage rates and levels of impurities. Total Cone 10 Shrinkage Rate: 16.5%
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