diatomaceous earth

diatomaceous earth
   1) [ geology ]
   A lacustrine or marine geologic deposit of fine, grayish, siliceous material composed chiefly or wholly of the remains of diatoms. It may occur as a powder or a rigid material (i.e., diatomite).
   GSST
   2) [ Soil Taxonomy ]
   A layer of soil material (limnic materials) that is composed of diatoms. Diatomaceous earth is identified by several diagnostic criteria such as moist color value which changes on drying as a result of the irreversible shrinkage of organic-matter coats on diatoms and either a moist color value of 8 or more and a chroma of 2 or less from a saturated sodium-pyrophosphate extract on white chromatographic or filter paper, or a cation-exchange capacity of less than 240 cmol (+) per kg organic matter (measured by loss on ignition).
   KST & ST

Glossary of landform and geologic terms. 2013.

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  • diatomaceous earth — di a*to*ma ceous earth (Geol.), a deposit of fine, usually white, siliceous material, composed mainly of the shells of the microscopic plants called diatoms; also called {infusorial earth}, {kieselguhr}, and {diatomite}. It is used in polishing… …   The Collaborative International Dictionary of English

  • diatomaceous earth — n DIATOMITE * * * infusorial e …   Medical dictionary

  • Diatomaceous earth — A sample of diatomaceous earth Diatomaceous earth (  / …   Wikipedia

  • diatomaceous earth — a fine siliceous earth composed chiefly of the cell walls of diatoms: used in filtration, as an abrasive, etc. Also called diatomite /duy at euh muyt /, kieselguhr. [1880 85] * * * or kieselguhr Light coloured, porous, and friable sedimentary… …   Universalium

  • diatomaceous earth — Infusorial In fu*so ri*al, a. (Zo[ o]l.) Belonging to the Infusoria; composed of, or containing, Infusoria; as, infusorial earth. [1913 Webster] {Infusorial earth} (Geol.), a deposit of fine, usually white, siliceous material, composed mainly of… …   The Collaborative International Dictionary of English

  • diatomaceous earth — A mineral formed by deposition of siliceous remains of diatoms, microscopic aquatic life forms. Diatomaceous earth has long been used as a catalyst support. Also known as Kieselguhr …   Petroleum refining glossary

  • diatomaceous earth — diatomitas statusas T sritis ekologija ir aplinkotyra apibrėžtis Silicitų grupės silpnai cementuota, labai poringa, lengva nuosėdinė uoliena. Susidariusi iš sucementuotų titnagdumblių dvinarių opalinių kiautelių (60–95 % masės sudaro opalas).… …   Ekologijos terminų aiškinamasis žodynas

  • diatomaceous earth — di′atoma′ceous earth′ n. gel a fine siliceous earth composed chiefly of the cell walls of diatoms and used in filtration. Also called di•at•o•mite [[t]daɪˈæt əˌmaɪt[/t]] • Etymology: 1880–85 …   From formal English to slang

  • diatomaceous earth —    A light colored, soft, siliceous earth composed of the shells of diatoms, a form of algae. Some deposits are of lake origin but the largest are marine [6] …   Lexicon of Cave and Karst Terminology

  • diatomaceous earth — /ˌdaɪətəmeɪʃəs ˈɜθ/ (say .duyuhtuhmayshuhs erth) noun a fine siliceous earth composed chiefly of cell walls of diatoms, used in filtration, as an abrasive, etc.; kieselguhr. Also, diatomite /daɪˈætəmaɪt/ (say duy atuhmuyt) …  

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