Large geological encyclopedia

Diatomaceous earth (Ger. Tripel, from the name of the city of Diatomaceous earth, Diatomaceous earth, North Africa, and *. Diatomaceous earthte, diatomaceous earthth; n. Tripel; p. Diatomaceous earth; and. Diatomaceous earth, tripol) - unconsolidated or weakly cemented, very light, finely opal sedimentary rock breed.

On the physico-chemical properties similar to diatomite, but almost devoid of organic residues and consists of globular calf diameter of 1-2 m, stacked amorphous silica (opal-cristobalite and a-cristobalite). Usually contains small amounts of clay substance, quartz grains, glauconite, feldspars. Color from white and gray to dark gray, brown, red and black.

Diatomaceous earth density ranges from 1200 to 2500 kg / m3. Volumetric weight monolith ranges from 700 to 1250 kg / m3 and a porosity of 50-70%, the strength typically 30-35 kg / cm2 or less. The main deposits of diatomaceous earth CCCP associated with deposits of the Upper Cretaceous basins.

Diatomaceous earth associated with volcanic sources of silica are small and confined to the spread of lacustrine sediments of the Oligocene and Miocene. Abroad (especially in the US) diatomaceous earth called chalcedony and quartz loose rocks formed by weathering silicified limestones which we are known as marshalite.

The origin is probably a biochemical. More than 75% of extracted diatomaceous earth used as a supplement in the cement industry, about 24% goes to the production of heat insulation and building materials. Diatomaceous earth used as a filter and polishing material.