1. A light, porous sedimentary rock composed of the fossilized remains of diatoms, used as an abrasive, filter, and insulator.
Usage: Also called diatomaceous earth or kieselguhr.; Common in industrial and scientific applications.

Examples

• Diatomite is widely used in water filtration systems because of its porous structure.
• The powder from diatomite deposits is an effective natural insecticide.
• Industrial manufacturers rely on diatomite as a mild abrasive in toothpaste and polishing compounds.
• Diatomite's low density makes it valuable as a thermal insulator in construction materials.
• The geologist identified the white sediment as diatomite based on the microscopic diatom shells it contained.