Transformation of aragonite to calcite in a marine gasteropod

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Abstract
A detailed examination of the aragonite to calcite transformation in samples of Strombus gigas from the Pleistocene of British Honduras demonstrates that the process is essentially isochemical with respect to strontium distribution. The contact between original skeletal aragonite and the replacement low magnesian calcite is not represented by visible pore space or by a chalky zone as reported from material described by other authors. A transformation process involving solution films of less than 100 Å (10 nm) and a closed chemical system is considered to be the most reasonable explanation based on the available data.

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