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Title: The crystal structure of nonmetamict Nb-rich zirconolite-3<italic>T</italic> from the Eifel paleovolcanic region, Germany.
Authors: Zubkova, Natalia V.; Pekov, Igor V.; Ksenofontov, Dmitry A.; Pushcharovsky, Dmitry Yu.; Chukanov, Nikita V.; Ternes, Bernd; Schüller, Willi
Abstract: The crystal structure of a Nb-rich zirconolite-3T from the Laach Lake volcano, Eifel, Germany, was studied by single-crystal XRD (R=0.0295). The mineral is trigonal, P3121; unit-cell dimensions are: a=7.3095(2), c=16.9604(5) Å, V=784.78(4) Å3. The empirical formula based on 14 O atoms (Z=3) is Ca1.28Ce0.31La0.14Nd0.12Pr0.06Th0.16 Zr1.94Hf0.04Ti1.74Nb1.22Fe0.72Mn0.28O14. The crystal-chemical formula based upon the structural model is: VIII(Ca0.70 Ce0.30)VIII(Ca0.58Ce0.32Th0.10)VII(Zr0.88Th0.04Hf0.02□0.06)2VII(□0.94 Zr0.06)2VI(Ti0.72Nb0.26Zr0.02)VI(Ti0.50Nb0.47Zr0.03)2IV(Fe0.355 Mn0.145)2O14 (Z=3).
Subjects: EIFEL (Germany); GERMANY; CRYSTAL structure; POLYTYPIC transformations; X-ray diffraction; VOLCANOES; METAMICTIZATION
Publication: Zeitschrift für Kristallographie. Crystalline Materials, 2018, Vol 233, Issue 7, p463
ISSN: 2194-4946
Publication type: Academic Journal
DOI: 10.1515/zkri-2017-2133

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The crystal structure of nonmetamict Nb-rich zirconolite-3<italic>T</italic> from the Eifel paleovolcanic region, Germany.