Diatomaceous Earth (AKA Silica) is an inert, odorless, very fine-grained, siliceous sedimentary rock. It is not actually an "earth" but it is the fossilized remains of microscopic shells created by one celled plants called diatoms.
Diatomaceous Earth is most commonly used in the laboratory as a filter aid because its microscopically fine, sharp edges will not pack too closely. It prevents very fine particles from either passing right through a paper filter or from clogging it completely.
Diatomaceous Earth has many other applications, such as an absorbent for industrial spills and as pet litter, a filler in a variety of products from paints to dry chemicals, an insulation material as well as a mild abrasive in polishes, and a silica additive in cement and various other compounds.
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