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countable and uncountable, plural aragonites
(mineralogy) An evaporite consisting of anhydrous calcium carbonate with the chemical formula CaCO3 and occurring in pearls, shells and nacre; it is dimorphous with calcite. quotations examples
The basic chemical material of molluscan shells is calcium carbonate, which forms the outer layer of calcite, and the inner layer of aragonite, which is a heavier and harder substance although it has the same chemical composition.Aragonite crystal.
1955, Rachel Carson, The Edge of the Sea, Boston: Houghton Mifflin, Appendix, p. 268