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* '''Bann clay''' is the variety found in the [[Lower Bann]] valley in Northern Ireland.
* ''Moler'' ([[Fur Formation|mo-clay]]) is the variety found in northwestern Denmark, especially on the islands of [[Fur (island)|Fur]] and [[Mors (island)|Mors]].
* ''Freshwater-derived food grade'' diatomaceous earth is the type used in the United States for grain storage, as feed supplement, and as an insecticide. It is very high in crystal silica (>90%) with fewer impurities than the garden grade. It is mixed in animal feed at a maximum rate of 2% of the dry weight of the ration, as required by law.
* ''Salt-water-derived garden grade'' is not suitable for human consumption because of the impurities (usually 15%), but is also effective as an insecticide, with a typical crystalline silica content of 85%.
== Microbial degradation ==
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