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Mineralogical Magazine; December 2001; v. 65; no. 6; p. 797-806; DOI: 10.1180/0026461016560010
© 2001 Mineralogical Society of Great Britain and Ireland
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Determination of six new polytypes in parisite-(Ce) by means of high resolution electron microscopy

Meng Dawei1,*, Wu Xiuling1, Mou Tao1 and Li Douxing2

1 Test Center, China University of Geosciences, Wuhan, 430074, P.R. China
2 Laboratory of Atomic Imaging of Solids, Institute of Metal Research, Academia Sinica, Shenyang, 110015, P.R. China

* E-mail: dwmeng{at}cug.edu.cn

The ultrastructures of parisite-(Ce) from a rare-earth mineral deposit of Sichuan Province, southwest China, have been observed and investigated by selected area electron diffraction (SAED) and high resolution electron microscopy (HREM). Six new polytypes 4H, 10H, 16H, 18R, 24R and 30R were determined in parisite-(Ce), as were their crystal structure types, subcell (a'c''', a'c'', a'c') and supercell (ac) parameters, reflection conditions, polytype features and probable space groups. The HREM studies revealed the complex polytypism in parisite-(Ce) whereby the six new polytypes, formed by long-period ordered stacking, always coexist with the common polytype parisite-(Ce)-6R by syntaxy and thus constitute the complex microstructural ‘syntactic polycrystals’, the host of which is the polytype parisite-(Ce)-6R.

KEYWORDS: parisite, polytype, high-resolution electron microscopy




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D. Meng, X. Wu, T. Mou, and D. Li
MICROSTRUCTURAL INVESTIGATION OF NEW POLYTYPES OF PARISITE-(Ce) BY HIGH-RESOLUTION TRANSMISSION ELECTRON MICROSCOPY
Can Mineral, December 1, 2001; 39(6): 1713 - 1724.
[Abstract] [Full Text] [PDF]


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