caa a22 4500 378881744 CHVBK 20180305123433.0 cr unu---uuuuu 161128e20030601xx s 000 0 eng 10.1524/zkri.218.6.392.20721 doi (NATIONALLICENCE)gruyter-10.1524/zkri.218.6.392.20721 Crystal structure of the K, Ti analogue of ilímaussite-(Ce), (Ba,K,Na,Ca)11-12(REE,Fe,Th)4(Ti,Nb)6(Si6O18)4(OH)12·4.5 H2O: revision of structure model and structural formula [Elektronische Daten] [Sergey V. Krivovichev, V. N. Yakovenchuk, Th. Armbruster, Y. A. Pakhomovskiy, W. Depmeier] The crystal structure of the K, Ti analogue of il¡maussite-(Ce), (Ba,K,Na,Ca)11-12(REE,Fe,Th)4(Ti,Nb)6(Si6O18)4(OH)12·4.5 H2O, from the Yukspor mountain, Khibiny massif, Kola peninsula, Russia, has been solved by direct methods and refined to R1 = 0.077 on the basis of 1762 reflections with |Fo| ≥ 4σF. The mineral is rhombohedral, R32, a = 10.708(2), c = 60.073(11) Å, V = 5965.2(17) Å3. The structure is based upon a heteropolyhedral framework that consists of layers of corner-linked polyhedra. The SiO4 tetrahedra share corners to form 6-membered rings which are further interlinked via REEO6 trigonal prisms and Tiφ6 octahedra (φ = O, OH). The obtained structure model is different from that recently reported by Rastsvetaeva et al. (2003) which is considered incorrect. © 2003 Oldenbourg Wissenschaftsverlag GmbH Crystallography nationallicence Inorganic chemistry nationallicence Organic chemistry nationallicence Krivovichev Sergey V. aut Yakovenchuk V. N. aut Armbruster Th aut Pakhomovskiy Y. A. aut Depmeier W. aut Zeitschrift für Kristallographie - Crystalline Materials De Gruyter Oldenbourg 218/6(2003-06-01), 392-396 2194-4946 218:6<392 2003 218 zkri https://doi.org/10.1524/zkri.218.6.392.20721 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/zkri.218.6.392.20721 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Krivovichev Sergey V. aut NATIONALLICENCE 700 1- Yakovenchuk V. N. aut NATIONALLICENCE 700 1- Armbruster Th aut NATIONALLICENCE 700 1- Pakhomovskiy Y. A. aut NATIONALLICENCE 700 1- Depmeier W. aut NATIONALLICENCE 773 0- Zeitschrift für Kristallographie - Crystalline Materials De Gruyter Oldenbourg 218/6(2003-06-01), 392-396 2194-4946 218:6<392 2003 218 zkri CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter