aragonite

[uh-rag-uh-nahyt, ar-uh-guh-]
noun
a mineral, orthorhombic calcium carbonate, CaCO 3 , chemically identical with calcite but differing in crystallization and in having a higher specific gravity and less marked cleavage.

Origin:
1795–1805; named after Aragon (the province, where first found) + -ite1

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World English Dictionary
aragonite (əˈræɡəˌnaɪt)
 
n
a generally white or grey mineral, found in sedimentary rocks and as deposits from hot springs. Composition: calcium carbonate. Formula: CaCO3. Crystal structure: orthorhombic
 
[C19: from Aragon + -ite1]

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American Heritage
Science Dictionary
aragonite   (ə-rāg'ə-nīt', ār'ə-gə-)  Pronunciation Key 
A usually white, yellowish, or pink orthorhombic mineral that can occur in many different colors. Aragonite occurs as acicular (needlelike) or tabular crystals, or as fibrous aggregates. It is found in gypsum deposits, at the tips of calcite crystals, in mollusk shells and pearls, and in living reef structures. It is a polymorph of calcite. Chemical formula: CaCO3.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
So will corals, especially those whose skeletons are composed of aragonite, a
  particularly unstable form of calcium carbonate.
Calcite and aragonite are the two crystal forms of calcium carbonate, a
  property of minerals geologists call dimorphism.
The team studied the saturation levels of aragonite, a form of calcium
  carbonate that drops as acidity of seawater rises.
Aragonite offers more active surface and more active adsorptive sites than
  calcite.
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