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A not-uncommon reference to bentonite because of its bloating when wetted; or to ball clays because of their particularly slippery and greasy-like texture when wet.
More normally, a clay-earth is fat when it is clay-rich, in the sense that an earth is referred to as clay-rich or clay-poor, and thereby fat or lean in clay content/proportion, which is to say its content/proportion of hydrous-layer alumina/alumino-silicate. Generally, the finer the grain size of a clay the fatter it is.
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XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="FAT CLAY" descrip="" searchkey="" loi="0.00" casnumber="70694-09-6">
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