Diatomaceous earth Wikipedia
Diatomaceous earth (/ d a. t m e s r /, DE), diatomite or kieselgur/kieselguhr is a naturally occurring, soft, siliceous sedimentary rock that is crumbled into a fine white to offwhite powder. It has a particle size ranging from less than 3 m to more than 1 mm, but typically 10 to 200 m. Depending on the granularity, this powder can have an abrasive feel