KENTUCKY OM #4 BALL CLAY
Old Mine #4OM4
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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