1. 
   diatomite
   Diatomite, or diatomaceous earth, is a siliceous sedimaentary rock formed from the accumulations of diatoms or other nanoplankton.
   Found op http://www.ucmp.berkeley.edu/glossary/glossary_2.html
   
   
2. 
   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 th...
   Found op http://www.britannica.com/eb/a-z/d/44
   
   
3. 
   Diatomite
   naturally occurring, soft, chalk-like sedimentary rock that is easily crumbled into a fine white to off-white powder.
   Found op http://en.wikipedia.org/wiki/Glossary_of_geology
   
   
4. 
   Diatomite
   Diatomite is a diatomaceous earth generally found underlying peat in various districts of Scotland. In Skye, at Loch Quire, where large supplies of diatomite were discovered in the 19th century, it is found about 45 cm below the surface, and extends downward for about two meters, and in some places ...
   Found op http://www.probertencyclopaedia.com/browse/HD.HTM
   
   
5. 
   diatomite
   1) Algae remains 2) Diatomaceous earth 3) Earth 4) Filter 5) Ground 6) Kieselguhr
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/diatomite/1
   
   

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