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[uh-rag-uh-nahyt, ar-uh-guh-] /əˈræg əˌnaɪt, ˈær ə gə-/
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 of aragonite
1795-1805; named after Aragon (the province, where first found) + -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for aragonite
  • 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.
  • The level at which aragonite and calcite are in thermodynamic equilibrium is known as the saturation depth.
  • The amount of phosphate released from aragonite was the nearly the same for the samples equilibrated for one and seven days.
  • The scale to the left is proportional to the level of aragonite present in the ocean.
  • aragonite, which occurs occasionally, does not seem to contain trace metals.
  • What makes the seawater look milky are suspended, mud-size particles of aragonite, a form of calcium carbonate.
British Dictionary definitions for aragonite


a generally white or grey mineral, found in sedimentary rocks and as deposits from hot springs. Composition: calcium carbonate. Formula: CaCO3. Crystal structure: orthorhombic
Word Origin
C19: from Aragon + -ite1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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aragonite in Science
  (ə-rāg'ə-nīt', ār'ə-gə-)   
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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