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From structure topology to chemical composition. XII. Titanium silicates: the crystal chemistry of rinkite, Na2Ca4REETi(Si2O7)2OF3

Published online by Cambridge University Press:  05 July 2018

F. Cámara ,
E. Sokolova  and
F. C. Hawthorne
F. Cámara*
Affiliation:
Dipartimento di Scienze Mineralogiche e Petrologiche, Università degli Studi di Torino, via Valperga Caluso 35, 10125 Torino, Italy CNR – Istituto di Geoscienze e Georisorse, unità di Pavia, via Ferrata 1, I-27100 Pavia, Italy
E. Sokolova
Affiliation:
CNR – Istituto di Geoscienze e Georisorse, unità di Pavia, via Ferrata 1, I-27100 Pavia, Italy
F. C. Hawthorne
Affiliation:
CNR – Istituto di Geoscienze e Georisorse, unità di Pavia, via Ferrata 1, I-27100 Pavia, Italy
*
*E-mail: fernando.camaraartigas@unito.it
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Abstract

Rinkite, ideally Na2Ca4REETi(Si2O7)2OF3, is a common mineral in alkaline and peralkaline rocks. The crystal structures of five rinkite crystals from three alkaline massifs: Ilimaussaq, Greenland; Khibiny, Kola Peninsula, Russia and Mont Saint-Hilaire, Canada, have been refined as two components related by the TWIN matrix (–1 0 0, 0 –1 0, 1 0 1) (Mo-αa radiation). The crystals, a = 7.4132-7.4414, b = 5.6595-5.6816, c = 18.8181-18.9431 Å, β = 101.353-101.424(2)°, V= 776.1-786.7 Å3, space group P21lc, Z = 2, Dcalc = 3.376—3.502 g cm–3, were analysed using an electron microprobe subsequent to collection of the X-ray intensity data. Transmission electron microscopy confirmed the presence of pseudomerohedral twinning in rinkite crystals. The crystal structure of rinkite is a framework of TS (titanium silicate) blocks. The TS block consists of HOH sheets (H-heteropolyhedral, O-octahedral). The TS block in rinkite exhibits linkage and stereochemistry typical for Group I (Ti = 1 a.p.f.u.) of Ti disilicate minerals: two H sheets connect to the O sheet such that two (Si2O7) groups link to the trans edges of a Na polyhedron of the O sheet. The crystal chemistry of rinkite and nacareniobsite-(Ce) is discussed.

Keywords

rinkitecrystal structureEMP analysistransmission electron microscopychemical formulaTi disilicate mineralsGroup I
Type
Research Article
Information
Mineralogical Magazine , Volume 75 , Issue 6 , December 2011 , pp. 2755 - 2774
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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Footnotes

†

Permanent address: Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada

‡

Permanent address: Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Moscow 109017, Russia

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CIF 1

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CIF 2

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CIF 3

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CIF 4

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CIF 5

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Anisotropic diplacement factors

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