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From structure topology to chemical composition.VIII. Titanium silicates: the crystal chemistry of mosandrite from type locality of Låven (Skådön), Langesundsfjorden, Larvik, Vestfold, Norway

Published online by Cambridge University Press:  05 July 2018

E. Sokolova  and
F. Cámara
E. Sokolova*
Affiliation:
CNR — Istituto di Geoscienze e Georisorse, unità di Pavia, Via Ferrata 1, I-27100 Pavia, Italy Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Moscow 109017, Russia Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
F. Cámara
Affiliation:
CNR — Istituto di Geoscienze e Georisorse, unità di Pavia, Via Ferrata 1, I-27100 Pavia, Italy
*
*E-mail: elena_sokolova@umanitoba.ca
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Abstract

The crystal structure of mosandrite, ideally Na2Ca4REETi(Si2O7)2OF3, a = 7.4184(8), b = 5.6789(6), c = 18.873(2) Å, β = 101.410(2)°, V = 779.35(5) Å3, space group P21/c, Z = 2, Dcalc = 3.363 g.cm-3, from the type locality, Låven (Skådön), Langesundsfjorden, Larvik, Vestfold, Norway, has been refined to Ri = 6.33% on the basis of 1113 unique reflections F°≥4σF. Electron microprobe analysis gave the empirical formula Na1.99(Ca3.93Sr0.02)Σ3.95(Ce0.41La0.16Nd0.13Pr0.04Sm0.02Dy0.01Y0.13)Σ0.90 (Ti0.864+Nb0.08Zr0.05)Σ0.99(Si207)2(F1.20O0.80)Σ2.00F2, Z = 2, calculated on the basis of 18 (O + F) a.p.f.u.. The crystal structure of mosandrite is a framework of TS (titanium silicate) blocks. The TS block consists of HOH sheets (H-heteropolyhedral, O-octahedral). The TS block in mosandrite exhibits linkage and stereochemistry typical for Group I (Ti = 1 a.p.f.u.) 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 O sheet cations give Na(NaCa)Ti (4 a.p.f.u.). The TS blocks link via common vertices of (Si2O7) groups and common vertices and edges of Ca-dominant MH and Ap polyhedra. Two adjacent TS blocks are related by the glide plane cy. Composition and topology of the TS block in mosandrite and rinkite are identical. The crystal structure of mosandrite from the type locality is topologically and chemically identical to that of rinkite from the type locality of Kangerdluarssuk, Greenland.

Keywords

mosandriterinkitecrystal structureEMP analysischemical formulaTi disilicate mineralsGroup Itype locality
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 4 , August 2008 , pp. 887 - 897
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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