Webster's English Dictionary

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aragonite

ara.go.nite \*-'rag-*-.ni-t, 'ar-*-g*-\ n [G aragonit, fr. Aragon, Spain] : 
   a mineral CaCO3 consisting like calcite of calcium carbonate but d iffering 
   from calcite in its orthorhombic crystallization, greater density, and less 
   distinct cleavage