Pyritization in some molluscan shells

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Abstract
Decomposition of organic matter within shell fragments appears to result in the formation of localized reducing environments that lead to the development of pyrite. The pyrite may preserve relic shell structure and thus show that the aragonite of the shell changes to calcite without a distinct soultion-cavity stage. In other cases pyrite distribution indicates that the more probable chemical change in shell composition is by the solution of aragonite followed almost immediately by calcite precipitation.

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