Calcined diatomaceous earth

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1. A product made by calcining diatomaceous earth (DE), a material composed of the calcified remains of microscopic life forms known as diatoms and used to condition soil by altering its ability to retain moisture.

300px-Diatomaceous_Earth_BrightField.jpg

Diatomaceous earth as viewed under bright field illumination on a light microscope. Calcined diatomaceous earth is heat-treated and activated for filters.

Source: https://en.wikipedia.org/wiki/Diatomaceous_earth