Abstract
THE calcium chloroborate minerals hilgardite and parahilgardite are classic examples of point group symmetries m and 1 respectively1,2. They were found in the Choctow salt dome, Louisiana and are both piezoelectric. The chemical composition, originally given as Ca8 (B6O11) 4C14·4H2O for both minerals (see refs 1 and 2), has been revised to Ca2(B5O8 (OH)2 Cl) (ref. 3). Our structure determination indicates the chemical composition to be Ca2B5O9Cl·H2O for both phases.
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References
Hurlbut, Jr, C. S. & Taylor, R. E. Am. Miner. 22, 1052–1057 (1937).
Hurlbut, Jr, C. S. Am. Miner. 23, 765–771 (1938).
Braitsch, O. Beiträge Miner. Petrogr. 6, 233–247 (1959).
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GHOSE, S., WAN, C. Hilgardite and parahilgardite piezoelectric zeolite type phases. Nature 270, 594–595 (1977). https://doi.org/10.1038/270594a0
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DOI: https://doi.org/10.1038/270594a0
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