Summary
X-ray diffraction studies of Brown Pelican eggshells from various localities in North America have shown that the crystalline shell material consists of three calcium carbonate polymorphs, calcite, aragonite and vaterite. The data suggest that thin eggshells show a high calcite to vaterite ratio compared with thicker Florida shells.
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Gould, R.W. Brown pelican eggshells: X-Ray diffraction studies. Bull. Environ. Contam. Toxicol. 8, 84–88 (1972). https://doi.org/10.1007/BF01684511
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DOI: https://doi.org/10.1007/BF01684511