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Xiuling, Wu, Dawei, Meng, Zhaolu, Pan, Guangming, Yang, Douxing, Li (1998) Transmission electron microscopic study of new, regular, mixed-layer structures in calcium-rare-earth fluorocorbonote minerals. Mineralogical Magazine, 62 (1) 55-64 doi:10.1180/002646198547468

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Reference TypeJournal (article/letter/editorial)
TitleTransmission electron microscopic study of new, regular, mixed-layer structures in calcium-rare-earth fluorocorbonote minerals
JournalMineralogical MagazineISSN0026-461X
AuthorsXiuling, WuAuthor
Dawei, MengAuthor
Zhaolu, PanAuthor
Guangming, YangAuthor
Douxing, LiAuthor
Year1998 (February)Volume62
Issue1
PublisherMineralogical Society
Download URLhttps://rruff.info/doclib/MinMag/Volume_62/62-1-55.pdf+
DOIdoi:10.1180/002646198547468Search in ResearchGate
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Mindat Ref. ID247Long-form Identifiermindat:1:5:247:3
GUID0
Full ReferenceXiuling, Wu, Dawei, Meng, Zhaolu, Pan, Guangming, Yang, Douxing, Li (1998) Transmission electron microscopic study of new, regular, mixed-layer structures in calcium-rare-earth fluorocorbonote minerals. Mineralogical Magazine, 62 (1) 55-64 doi:10.1180/002646198547468
Plain TextXiuling, Wu, Dawei, Meng, Zhaolu, Pan, Guangming, Yang, Douxing, Li (1998) Transmission electron microscopic study of new, regular, mixed-layer structures in calcium-rare-earth fluorocorbonote minerals. Mineralogical Magazine, 62 (1) 55-64 doi:10.1180/002646198547468
In(1998, February) Mineralogical Magazine Vol. 62 (1) Mineralogical Society
Abstract/NotesAbstractStructures of calcium-rare-earth (Ca-RE) fluorocarbonate minerals from southwest China have been investigated using selected area electron diffraction (SAED) and high-resolution transmission electron microscopy (HRTEM). They are described as combinations of layers of bastnäsite-(Ce), CeFCO3 (B layers), and synchysite-(Ce), CeFCO3·CaCO3 (S layers) (Donnay and Donnay, 1953). We report here the discovery of six new, regular, mixed-layer structures in parisite-(Ce) observed using SAED and HRTEM. The symmetry, cell parameters, chemical formulae and stacking of the structural unit layers, etc., were determined for each. The regular, mixed-layer structures are formed by stacking unit layers of bastnäsite-(Ce) and synchysite-(Ce) in varying proportions along the c axis. HRTEM shows that there are different distribution modes for the Ce-F ion layers, the CO3 ion groups between the Ce-F ion layers and the CO3 ion groups between the Ce-F and Ca ion layers. The minerals may be regarded as polymorphs with the same chemical composition and the same spacing of the unit layers, but different arrangements of ion layers in the structural unit layers and different stacking sequences of the structural unit layers.


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