diatomite

(dī atə mīt′)

noun

a light-colored, soft sedimentary rock formed mainly of the siliceous shells of diatoms and used in a finely pulverized state as an abrasive, absorbent, filter, etc.
also called diatomaceous earth

See diatomite in American Heritage Dictionary 4

noun
A fine, powdered diatomaceous earth used in industry as a filler, a filtering agent, an absorbent, a clarifier, and an insulator. Also called kieselguhr.

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