Diatomaceous earth

Diatomaceous earth, also known as diatomite, celite, or kieselgur, is a naturally occurring, soft, siliceous sedimentary rock that can be crumbled into a fine white to off-white powder. It has a particle size ranging from more than 3 mm to less than 1 μm, but typically 10 to 200 μm. Depending on the granularity, this powder can have an abrasive feel, similar to pumice powder, and has a low density as a result of its high porosity.

The typical chemical composition of oven-dried diatomaceous earth is 80–90% silica, with 2–4% alumina, and 0.
5–2% iron oxide.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 2.0

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