珪けい藻そう土ど

noun

diatomaceous earth; diatomite; kieselguhr

Geological term for a soft, siliceous sedimentary rock used in filtration, insulation, and as an abrasive.

• 珪けい藻そう土どはビールのろ過かに使つかわれる。

  Diatomaceous earth is used for filtering beer.

• この地ち域いきでは良りょう質しつの珪けい藻そう土どが採とれる。

  High-quality diatomite is mined in this region.