ARAGONITE
aragonite
(noun) a mineral form of crystalline calcium carbonate; dimorphic with calcite
Source: WordNet® 3.1
Etymology
Noun
aragonite (countable and uncountable, plural aragonites)
(mineral) A saline evaporite consisting of anhydrous calcium carbonate with the chemical formula CaCO3; it is dimorphous with calcite.
Source: Wiktionary
A*rag"o*nite, n. Etym: [From Aragon, in Spain.] (Min.)
Definition: A mineral identical in composition with calcite or carbonate of
lime, but differing from it in its crystalline form and some of its
physical characters.
Source: Webster’s Unabridged Dictionary 1913 Edition