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calcite

   Also found in: Dictionary/thesaurus, Acronyms, Encyclopedia, Wikipedia 0.01 sec.
calcite,
n an abrasive agent made from crystallized natural calcium carbonate.
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The amazing part, however, is that the teeth, which need to be harder and stronger than the rocky limestone being dug out, are themselves made almost entirely of calcite - the same calcite that makes up much of the limestone.
Sea urchins' digging teeth are designed to stay sharp by Asian News International
When the solid calcite precipitated, or separated from the water solution, it left behind a river of crystals, says Penny Boston, director of the Cave and Karst Studies Program at New Mexico Tech.
Snowy River by Brusso, Charlene / Science World
Magnesium traces in calcite forms a nice pink dolomite layer, while magnesium in silicate accounts for the purples of amethyst.
What Is a Geode? by Claudia Mann / Reference and Education community
 
 
 
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