calcite

[kal-sahyt]
noun
one of the commonest minerals, calcium carbonate, CaCO 3 , found in a great variety of crystalline forms: a major constituent of limestone, marble, and chalk; calc-spar.

Origin:
1840–50; calc- + -ite1

calcitic [kal-sit-ik] , adjective
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World English Dictionary
calcite (ˈkælsaɪt)
 
n
a colourless or white mineral (occasionally tinged with impurities), found in sedimentary and metamorphic rocks, in veins, in limestone, and in stalagmites and stalactites. It is used in the manufacture of cement, plaster, paint, glass, and fertilizer. Composition: calcium carbonate. Formula: CaCO3. Crystal structure: hexagonal (rhombohedral)
 
calcitic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

calcite
1849, from Ger. Calcit, coined by Austrian mineralogist Wilhelm Karl von Hardinger (1795-1871), from L. calx (gen. calcis) "lime" + mineral suffix -ite (Ger. -it).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
calcite   (kāl'sīt')  Pronunciation Key 
A usually white, clear, pale-yellow or blue orthorhombic mineral. Calcite occurs in many different forms and is the main component of chalk, limestone, and marble. It is a polymorph of aragonite. Chemical formula: CaCO3.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Wander among impressive calcite formations erupting from the ground and hanging
  from the ceiling.
Corals use the calcite carbonate form while oysters, mussels etc use aragonite.
The primary source of calcite, or calcium carbonate, is the secretions of
  certain sea creatures.
In both cases, the researchers carved out a hiding place in a crystal of the
  mineral calcite.
Image for calcite
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