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.
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