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Mineralogical Magazine; February 2003; v. 67; no. 1; p. 73-77; DOI: 10.1180/0026461036710085
© 2003 Mineralogical Society of Great Britain and Ireland
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Space symmetry of prehnite, Ca2Al[6](Si3AlO10)(OH)2, from the Tieshan iron mineral deposit, Central China

W.-y. Zhao1,*, X.-w. Liu2, Q.-y. Wang3 and Q.-j. Zhang1

1 State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
2 Center of Testing and Analysis, China University of Geosciences, Wuhan 430074, China
3 Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

* E-mail: wyzhao{at}mail.whut.edu.cn

The space symmetry of prehnite, a mineral which occurs in cavities and veins within skarn from the Tieshan iron mineral deposit, Daye, Hubei province, central China, has been determined using selected area electron diffraction (SAED) and convergent-beam electron diffraction (CBED) on the submicrometer scale. Our results confirm that natural prehnite may belong to space group Pncm. The unit-cell parameters of the prehnite investigated ( a = 0.458 nm, b = 0.555 nm and c = 1.853 nm) have been calculated using the multicrystal diffraction rings of gold, the internal standard.

KEYWORDS: prehnite, selected area electron diffraction, convergent-beam electron diffraction






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