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Diatomite

naturally occurring, soft, chalk-like sedimentary rock that is easily crumbled into a fine white to off-white powder.
Found on http://en.wikipedia.org/wiki/Glossary_of_geology

diatomite

(from the article `algae`) ...cell walls, of diatoms are made of opaline silica and contain many fine pores. Large quantities of frustules are deposited in some ocean and lake ... ...resemble chalk, but it is much lighter than chalk and will not effervesce in acid. Under a high-powered microscope the form of the diatoms can be ... [2...
Found on http://www.britannica.com/eb/a-z/d/44

Diatomite

A light colored, fine-grained siliceous sedimentary rock that forms from a sediment rich in diatom r
Found on http://www.encyclo.co.uk/local/22392

diatomite

Diatomite, or diatomaceous earth, is a siliceous sedimentary rock formed from the accumulations of diatoms or other nanoplankton.
Found on http://www.scientificpsychic.com/etc/geology-glossary.html

diatomite

Diatomite, or diatomaceous earth, is a siliceous sedimaentary rock formed from the accumulations of diatoms or other nanoplankton.
Found on http://www.ucmp.berkeley.edu/glossary/gloss2geol.html

diatomite

Diatomite, or diatomaceous earth, is a siliceous sedimaentary rock formed from the accumulations of diatoms or other nanoplankton.
Found on http://www.ucmp.berkeley.edu/glossary/glossary_2.html
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