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Diatomite rock sample from Sisquoc Formation Scanning electron micrograph of diatomaceous earth. Diatomaceous earth (/ ËŒ d aɪ. É™ t É™ ˈ m eɪ ʃ É™ s / DY-É™-tÉ™-MAY-shÉ™s), also known as diatomite (/ d aɪ ˈ æ t É™ m aɪ t / dy-AT-É™-myte), celite, or kieselguhr, is a naturally occurring, soft, siliceous sedimentary rock that can be crumbled into a fine white to off-white powder.
Diatomaceous earth is a soft, siliceous, sedimentary rock made up of the cell walls/shells of single cell diatoms and readily crumbles to a fine powder. Diatom cell walls are bivalve , i.e. made up of two halves, and are made up of biogenic silica ; silica synthesised in the diatom cell by the polymerisation of silicic acid .
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Samian earth: Pliny in c. 50 AD (Nat. Hist.) details two distinct varieties, colyrium - an eye salve, and aster, which was used as a soap as well as in medicines. Terra sigillata strigoniensis (Strigian earth, derived from Silesia ) - this clay, yellow in colour, appears to have been famous later in medieval times.
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Diatomaceous earth – a naturally occurring, soft, siliceous sedimentary rock made up of the cell walls/shells of single cell diatoms – as viewed under bright field illumination on a light microscope. The primary uses of diatomaceous earth are for cleaning (scouring), filtration, heat-resistive insulation and as an inert absorbent substrate.
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