cal·cite

[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

cal·cit·ic [kal-sit-ik] , adjective
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World English Dictionary
calcite (ˈkælsaɪt) [Click for IPA pronunciation guide]
 
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

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00:10
Calcite is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
the offspring of a zebra and a donkey.
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
Over thousands of years, a solid, almost perfectly round calcite pearl is
  formed.
In both cases, the researchers carved out a hiding place in a crystal of the
  mineral calcite.
Wander among impressive calcite formations erupting from the ground and hanging
  from the ceiling.
No longer able to hold the dissolved calcite, the drop deposited its tiny
  mineral load as a crystal of calcite.
Image for calcite
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