Reports

Gallstone of Unusual Composition: Calcite, Aragonite, and Vaterite

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Science  08 Mar 1968:
Vol. 159, Issue 3819, pp. 1113-1114
DOI: 10.1126/science.159.3819.1113

Abstract

A gallstone of almost perfect octahedral symmetry was composed of a mixture of crystallites of the three polymorphous forms of calcium carbonate: calcite, aragonite, and vaterite.