Diatomite, also known as diatomaceous earth, is a sedimentary rock composed of the fossilized remains of diatoms. Diatoms are microscopic organisms that have a complex shell made of silica, which is what gives diatomite its unique properties. Some synonyms for diatomite include kieselguhr, tripoli, and celite. Kieselguhr is a German word that means "chalky earth," and is often used interchangeably with diatomite. Tripoli is a name given to diatomite deposits found in North Africa, and celite is a trade name for a type of diatomite that is used as a filter aid. Other synonyms for diatomite include diatomaceous earth, diatomite filter aid, and fossil flour. Regardless of the name, diatomite is a versatile material that has a wide range of industrial and commercial applications.