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Sveinbergeite, Ca(Fe2+6 Fe3+)Ti2(Si4O12)2O2(OH)5(H2O)4, a new astrophyllite-group mineral from the Larvik Plutonic Complex, Oslo Region, Norway: description and crystal structure

Published online by Cambridge University Press:  05 July 2018

A. P. Khomyakov ,
F. Cámara ,
E. Sokolova ,
Y. Abdu  and
F. C. Hawthorne
A. P. Khomyakov
Affiliation:
Institute of Mineralogy, Geochemistry and Crystal Chemistry of Rare Elements, Veresaev Street 15, Moscow, 121357, Russia
F. Cámara*
Affiliation:
Dipartimento di Scienze Mineralogiche e Petrologiche, Università degli Studi di Torino, via Valperga Caluso 35, 10125 Torino, Italy
E. Sokolova
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Moscow, 119017, Russia
Y. Abdu
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
F. C. Hawthorne
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
*
*E-mail: fernando.camaraartigas@unito.it
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Abstract

Sveinbergeite, Ca(Fe2+6Fe3+)Ti2(Si4O12)2O2(OH)5(H2O)4, is a new astrophyllite-group mineral discovered in a syenite pegmatite at Buer on the Vesteroya peninsula, Sandefjord, Oslo Region, Norway. The mineral occurs in pegmatite cavities as 0.01—0.05 mm thick lamellar (0.2—0.5×5—10 mm) crystals forming rosette-like divergent groups and spherical aggregates, which are covered by brown coatings of iron (and possibly manganese) oxides, associated with magnesiokatophorite, aegirine, microcline, albite. calcite, fluorapatite, molybdenite, galena and a hochelagaite-like mineral. Crystals of sveinbergeite are deep green with a pale green streak and a vitreous and pearly lustre. Sveinbergeite has perfect cleavage on ﹛001﹜ and a Mohs hardness of 3. Its calculated density is 3.152 g/cm3. It is biaxial positive with α 1.745(2), β 1.746(2), γ 1.753(2), 2V(meas.) = 20(3)°. The mineral is pleochroic according to the scheme Z > X ∽ Y : Z is deep green, X and Y are brownish green. Orientation is as follows: X ┴ L (001), Y ᶺ b = 12°, Z = a, elongation positive. Sveinbergeite is triclinic, space group P1̄, a = 5.329(4), b = 11.803(8), c = 11.822(8) Å; α = 101.140(8)°, β = 98.224(8)°, γ = 102.442(8)°; V = 699.0(8) Å3; Z = 1. The nine strongest lines in the X-ray powder diffraction pattern [d in Å(I)(hkl)] are: 11.395(100)(001,010). 2.880(38)(004), 2.640(31)(2̄10,l̄41), 1.643(24)(07̄1,072), 2.492(20)(2l̄l), 1.616(15)(070), 1.573(14)(3̄2̄2), 2.270(13)(1̄3̄4) and 2.757(12)(1̄40,1̄3̄2). Chemical analysis by electron microprobe gave Nb2O5 0.55, TiO2 10.76, ZrO2 0.48, SiO2 34.41, A12O3 0.34, Fe2O3 5.57, FeO 29.39, MnO 1.27, CaO 3.87, MgO 0.52, K2O 0.49, Na2O 0.27, F 0.24, H2O 8.05, O=F -0.10, sum 96.11 wt.%, the amount of H2O was determined from structure refinement, and the valence state of Fe was calculated from structure refinement in accord with Mossbauer spectroscopy. The empirical formula, calculated on the basis of eight (Si + Al) p.f.u., is (Ca0.95Na0.12K0.14)Σ1.21(Fe2+5.65Fe3+0.93Mn0.25Mg0.18)Σ7.01(Ti1.86Nb0.06Zr0.05Fe3+)Σ2 (Si7091Al0.09)Σ8O34.61H12.34F0.17, Z = 1. The infrared spectrum of the mineral contains the following absorption frequencies: 3588, ∽3398 (broad), ∽3204 (broad), 1628, 1069, 1009, 942, 702, 655 and 560 cm–1. The crystal structure of the mineral was solved by direct methods and refined to an R1 index of 21.81%. The main structural unit in the sveinbergeite structure is an HOH layer which is topologically identical to that in the astrophyllite structure. Sveinbergeite differs from all other minerals of the astrophyllite group in the composition and topology of the interstitial A and B sites and linkage of adjacent HOH layers. The mineral is named in honour of Svein Arne Berge (b. 1949), a noted Norwegian amateur mineralogist and collector who was the first to observe and record this mineral from its type locality as a potential new species.

Keywords

sveinbergeitenew mineralcrystal structureastrophyllite groupLarvik plutonic complexBuer syenite pegmatiteSandefjordOslo RegionNorway
Type
Research Article
Information
Mineralogical Magazine , Volume 75 , Issue 5 , October 2011 , pp. 2687 - 2702
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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References

Andersen, F., Berge, S.A. and Burvald, I. (1996) Die Mineralien des Langesundsfjords und des umgebenden Larvikit-Gebietes, Oslo Region, Norwegen. Mineralien-Welt, 4(1), 100-.Google Scholar
Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C. (1995) Handbook of Mineralogy Volume II. Silica, Silicates Part 1. Mineral Data Publishing, Tucson, Arizona, USA, 446 pp.Google Scholar
Belov, N.V. (1963) Essays on structural mineralogy. XIV. 97. Ba,Fe-titanosilicate - bafertisite. 98. Anion role of Ti and Zr. Titanates, zirconates, titanosilicates, zirconosilicates. Mineralogicheskii Sbornik L’vovskogo Geologicheskogo Obshchestva, N17, 29-. [in Russian].Google Scholar
Belov, N.V. (1976) Essays on structural mineralogy. Nedra, Moscow [in Russian].Google Scholar
Brown, I.D. (1981) The bond-valence method: an empirical approach to chemical structure and bonding. Pp. 1-30 in: Structure and Bonding in Crystals II (O’Keeffe, M. and Navrotsky, A., editors). Academic Press, New York.Google Scholar
Cámara, F., Sokolova, E., Hawthorne, F.C. and Abdu, Y. (2008) From structure topology to chemical composition. IX. Titanium silicates: revision of the crystal chemistry of lomonosovite and murmanite, group-IV minerals. Mineralogical Magazine, 72, 1207-1228.CrossRefGoogle Scholar
Cámara, F., Sokolova, E., Abdu, Y. and Hawthorne, F.C. (2010) The crystal structures of niobophyllite, kupletskite-(Cs) and Sn-rich astrophyllite; revisions to the crystal chemistry of the astrophyllite-group minerals. The Canadian Mineralogist, 48, 1-16.CrossRefGoogle Scholar
Engvoldsen, T., Andersen, F., Berge, S.A. and Burvald, I. (1991) Pegmatittmineraler fra Larvik ringkompleks. Stein, 18, 15-71. [in Norwegian].Google Scholar
Kampf, A.R., Rossman, G.R., Steele, I.M., Pluth, J.J., Dunning, G.E. and Walstrom, R.E. (2010) Devitoite, a new heterophyllosilicate mineral with astrophyllite-like layers from eastern Fresno County, California. The Canadian Mineralogist, 48, 29-40.CrossRefGoogle Scholar
Khomyakov, A.P. (1996) Transformation mineral species and their use in palaeomineralogical reconstructions. 30th International Geological Congress (Beijing), 2/3, 450, [from abstract].Google Scholar
Khomyakov, A.P. (2008) The largestsource of minerals with unique structure and properties. Pp. 71-77 in: Minerals as Advanced Materials I (Krivovichev, S.V., editor). Springer, Berlin, 256 pp.CrossRefGoogle Scholar
Khomyakov, A.P. and Yushkin, N.P. (1981) The principle of inheritance in crystallogenesis. Doklady Akademii Nauk SSSR, 256, 1229-1233. [in Russian].Google Scholar
Larsen, A.O. (editor) (2010) The Langesundsfjord. History, Geology, Pegmatites, Minerals. Bode, Salzhemmendorf, Germany, 240 pp.Google Scholar
Mandarino, J.A. (1981) The Gladstone-Dale relationship. IV. The compatibility concept and its application. The Canadian Mineralogist, 41, 989-1002.Google Scholar
Nickel, E.H., Rowland, J.F. and Charette, D.J. (1964) Niobophyllite – the niobium analogue of astrophyllite: a new mineral from Seal Lake, Labrador. The Canadian Mineralogist, 8, 40-52.Google Scholar
Piilonen, P.C., Lalonde, A.E., McDonald, A.M., Gault, R.A. and Larsen, A.O. (2003a) Insights into astrophyllite-group minerals. I. Nomenclature, composition and development of a standardized general formula. The Canadian Mineralogist, 41, 1-26.CrossRefGoogle Scholar
Piilonen, P.C., McDonald, A.M. and Lalonde, A.E. (2003b) Insights into astrophyllite-group minerals. II. Crystal chemistry. The Canadian Mineralogist, 41, 27-54.CrossRefGoogle Scholar
Raade, G., Haug, J., Kristiansen, R. and Larsen, A.O. (1980) Langesundsfjord. Lapis, 5(10), 28-.Google Scholar
Sheldrick, G.M. (2008) A shorthist ory of SHELX. Acta Crystallographica, A64, 122-.Google Scholar
Sokolova, E. and Cámara, F. (2008) Reinvestigation of the crystal structure of magnesium astrophyllite. European Journal of Mineralogy, 20, 253-260.CrossRefGoogle Scholar
Sokolova, E.V. and Hawthorne, F.C. (2004) The crystal chemistry of epistolite. The Canadian Mineralogist, 42, 797-806.CrossRefGoogle Scholar
Wilson, A.J.C. (editor) (1992) International Tables for Crystallography. Volume C: Mathematical, Physical and Chemical Tables. Kluwer Academic Publishers, Dordrecht, The Netherlands.Google Scholar
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