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Savelievaite, Mg2CrO2(BO3), the first natural borate with species-defining Cr3+ and the ludwigite–savelievaite isomorphous series

Published online by Cambridge University Press:  17 May 2024

Igor V. Pekov ,
Nadezhda V. Vakhrusheva ,
Natalia V. Zubkova ,
Vasiliy O. Yapaskurt ,
Yulia S. Shelukhina ,
Yuriy V. Erokhin Open the ORCID record for Yuriy V. Erokhin [Opens in a new window] ,
Maria O. Bulakh ,
Sergey N. Britvin Open the ORCID record for Sergey N. Britvin [Opens in a new window] ,
Anatoly V. Kasatkin Open the ORCID record for Anatoly V. Kasatkin [Opens in a new window]  and
Anna G. Turchkova
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Igor V. Pekov*
Affiliation:
Faculty of Geology, Moscow State University, Leninskie Gory, 119991 Moscow, Russia
Nadezhda V. Vakhrusheva
Affiliation:
Zavaritsky Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences, Akademika Vonsovskogo str. 15, 620110, Yekaterinburg, Russia
Natalia V. Zubkova
Affiliation:
Faculty of Geology, Moscow State University, Leninskie Gory, 119991 Moscow, Russia
Vasiliy O. Yapaskurt
Affiliation:
Faculty of Geology, Moscow State University, Leninskie Gory, 119991 Moscow, Russia
Yulia S. Shelukhina
Affiliation:
Institute of Earth Sciences, St Petersburg State University, University Embankment 7/9, 199034 St Petersburg, Russia
Yuriy V. Erokhin
Affiliation:
Zavaritsky Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences, Akademika Vonsovskogo str. 15, 620110, Yekaterinburg, Russia
Maria O. Bulakh
Affiliation:
Faculty of Geology, Moscow State University, Leninskie Gory, 119991 Moscow, Russia
Sergey N. Britvin
Affiliation:
Institute of Earth Sciences, St Petersburg State University, University Embankment 7/9, 199034 St Petersburg, Russia
Anatoly V. Kasatkin
Affiliation:
Fersman Mineralogical Museum of Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia
Anna G. Turchkova
Affiliation:
Faculty of Geology, Moscow State University, Leninskie Gory, 119991 Moscow, Russia
Dmitry Yu. Pushcharovsky
Affiliation:
Faculty of Geology, Moscow State University, Leninskie Gory, 119991 Moscow, Russia
*
Corresponding author: Igor V. Pekov; Email: [email protected]
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Abstract

The new ludwigite-group mineral savelievaite, ideally Mg2Cr3+O2(BO3), was found in the chromitite body at the Malaya Kharamatalou river valley, Voikar–Syninskiy ultrabasic complex, Polar Urals, Russia. Savelievaite and Cr-enriched ludwigite occur in clinochlore veinlets and are associated with earlier magnesiochromite, spinel, chromite, pargasite, diopside, forsterite, serpentine, magnetite and pentlandite. Savelievaite forms prismatic, acicular or fibrous crystals up to 0.05 × 0.4 mm, usually assembled in radiating or chaotic clusters up to 1 × 1.5 mm across. It is opaque, black to greenish-black. The lustre is vitreous for prismatic crystals and silky for fibrous aggregates. D(calc.) = 3.91 g cm–3. Under the microscope in reflected light, savelievaite is grey, non-pleochroic, with weak bireflectance and anisotropism. The chemical composition (wt.%, EMPA, Fe2+:Fe3+ ratio by stoichiometry) is: MgO 34.88, FeO 10.83, NiO 0.36, B2O3 16.80, Al2O3 2.97, V2O3 0.21, Cr2O3 21.97, Fe2O3 12.40, TiO2 0.43, total 100.85. The empirical formula calculated on the basis of 5 O apfu is (Mg1.72Fe2+0.30Ni0.01)Σ2.03(Cr3+0.57Fe3+0.31Al0.12Ti0.01V3+0.01)Σ1.02B0.96O5. Savelievaite is orthorhombic, space group Pbam, a = 9.2631(6), b = 12.2298(8), c = 3.0104(2) Å, V = 341.04(4) Å3 and Z = 4. The strongest reflections of the powder X-ray diffraction pattern [d,Å(I)(hkl)] are: 5.101(100)(120); 2.551(90)(240); 2.524(88)(201); 2.163(36)(250); and 2.033(55)(321). The crystal structure was solved from single-crystal X-ray diffraction data and refined to R1 = 0.0405. Savelievaite is isostructural with ludwigite, Cr3+ is concentrated at the M4 site. The mineral is named in honour of the Russian petrologist and geologist Dr. Galina Nikolaevna Savelieva (b. 1936). Ludwigite, ideally Mg2Fe3+O2(BO3), and savelievaite form a continuous isomorphous series in which Cr3+ content varies from 0 to 0.60 apfu. Occurrences of Cr-enriched (>1 wt.% Cr2O3) varieties of ludwigite are mainly related to ultrabasic complexes. The Cr-richest (>10 wt.% Cr2O3) ludwigite–savelievaite-series members are found in chromite ores at the Voikar–Syninskiy complex and Volchiegorskoe and Tatishchevskoe deposits, both in the South Urals.

Keywords

savelievaitenew mineralludwigitemagnesium chromium boratecrystal structurechromite depositVoikar–Syninskiy ultrabasic complexUrals
Type
Article
Information
Mineralogical Magazine , Volume 88 , Issue 4 , August 2024 , pp. 430 - 438
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland

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Footnotes

Associate Editor: Daniel Atencio

†

Deceased 17 June 2023

References

Aleksandrov, S.M. (1990) Geochemistry of Formation of Skarns and Ores in Dolomites. Nauka Publishing, Moscow. 344 pp. [in Russian].Google Scholar
Aleksandrov, S.M. and Troneva, M.A. (1998) Chromium isomorphism in endogenic borates and geochemical characteristics of their genesis. Geochemistry International, 36, 599–610.Google Scholar
Aleksandrov, S.M. and Troneva, M.A. (2000) Isomorphism in borates of the ludwigite-vonsenite series from magnesian skarns of North America. Geochemistry International, 38, 144–158.Google Scholar
Aleksandrov, S.M. and Troneva, M.A. (2004) Genesis and composition of borates of the ludwigite-vonsenite series in magnesian skarns of the Urals, Siberia, and the Russian Far East. Geochemistry International, 42, 449–464.Google Scholar
Aleksandrov, S.M. and Troneva, M.A. (2008) Heterovalent isomorphism in the magnesium-iron borates. Geochemistry International, 46, 800–813.CrossRefGoogle Scholar
Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C. (2003) Handbook of Mineralogy. V. Borates, Carbonates, Sulfates. Mineral Data Publishing, Tucson. 813 pp.Google Scholar
Appel, P.W.U. and Brigatti, M.F. (1999) Ludwigite from central Sweden: new data and crystal structure refinement. Mineralogical Magazine, 63, 511–518.CrossRefGoogle Scholar
Bertaut, E.F. (1950) Structures des boroferrites. Acta Crystallographica, 3, 473–474.CrossRefGoogle Scholar
Bilohuščin, V., Uher, P., Koděra, P., Miloská, S., Mikuš, T. and Bačík, P. (2017) Evolution of borate minerals from contact metamorphic to hydrothermal stages: Ludwigite-group minerals and szaibélyite from Vysoká – Zlatno skarn, Slovakia. Mineralogy and Petrology, 111, 643–658.CrossRefGoogle Scholar
Britvin, S.N., Dolivo-Dobrovolsky, D.V. and Krzhizhanovskaya, M.G. (2017) Software for processing the X-ray powder diffraction data obtained from the curved image plate detector of Rigaku RAXIS Rapid II diffractometer. Zapiski Rossiiskogo Mineralogicheskogo Obshchetstva, 146, 104–107.Google Scholar
Brovkin, A.A., Rozhdestvenskaya, I.V. and Rykova, E.A. (2002) Cation distribution in the structure of titanium-containing ludwigite. Crystallography Reports, 47, 412–414.CrossRefGoogle Scholar
Burns, P.C., Cooper, M.A. and Hawthorne, F.C. (1994) Jahn-Teller distorted Mn3+O6 octahedra in fredrikssonite, the fourth polymorph of Mg2Mn3+(BO3)O2. The Canadian Mineralogist, 32, 397–403.Google Scholar
Enholm, Z. (2016) Mineral Chemistry and Paragenesis of Oxyborates in Metamorphosed Fe-Mn Oxide Deposits. Uppsala University, Sweden. 98 pp.Google Scholar
Ericksen, G.E., Mrose, M.E., Marinenko, J.W. and McGee, J.J. (1986) Mineralogical studies of the nitrate deposits of Chile. V. Iquiqueite, Na4K3Mg(CrO4)B24O39(OH)⋅12H2O, a new saline mineral. American Mineralogist, 71, 830–836.Google Scholar
Graudin', A.E. and Baklanov, B.G. (1973) On ludwigite find in chromite ore. VII Geological Conference “Geology and Mineral Resources of the North-East of the European Part of the USSR and North Urals”, Syktyvkar. Volume of Abstracts 2, 434–435 [in Russian].Google Scholar
Grew, E.S. and Anovitz, L.M. (1996)(editors) Boron: Mineralogy, Petrology, and Geochemistry. Reviews in Mineralogy and Geochemistry Vol. 33. Mineralogical Society of America and the Geochemical Society, Washington, DC.Google Scholar
Hawthorne, F.C., Burns, P.C. and Grice, J.D. (1996) The crystal chemistry of boron. Pp. 41–115 in: Boron, Mineralogy, Petrology and Geochemistry (Grew, E.S. and Anovitz, L.M., editors). Reviews in Mineralogy and Geochemistry, 33. The Mineralogical Society of America, Washington DC.CrossRefGoogle Scholar
Holtstam, D. (2001) Crystal chemistry of a manganian ludwigite. Neues Jahrbuch für Mineralogie, Monatshefte, 11, 500–528.Google Scholar
Irwin, M.B. and Peterson, R.C. (1999) The crystal structure of ludwigite. The Canadian Mineralogist, 37, 939–943.Google Scholar
Kato, A., Matsubara, S. and Hashimoto, E. (1988) A chromian ludwigite and a nickeloan hörnesite from Hayama nickel mine, Fukushima Prefecture, Japan. Bulletin of the National Science Museum. Series C. Geology & Paleontology, 14, 87–96.Google Scholar
Kuznetsov, I.E. (2003) Ludwigite from chromite occurrences of Urals. IV All-Russian Conference “Mineralogy of Urals – 2003”, Miass, Russia. Volume of Abstracts 1, pp. 172–175 [in Russian].Google Scholar
Leite, C.A.F., Guimarães, R.B., Fernandes, J.C., Continentino, M.A., Paschoal, C.W.A., Ayala, A.P. and Guedes, I. (2002) Temperature-dependent Raman scattering study of Fe3O2BO3 ludwigite. Journal of Raman Spectroscopy, 33, 1–5.CrossRefGoogle Scholar
Mel'nitsky, V.V. (1958) On ludwigite finds at Urals and ludwigite mineralization in other regions of the USSR. Trudy NIIGKhS, 4, 136–147 [in Russian].Google Scholar
Nakamoto, K. (2009) Infrared and Raman Spectra of Inorganic and Coordination Compounds. Part A. 6th edition. Wiley & Sons, NJ, 419 pp.Google Scholar
Norrestam, R., Dahl, S. and Bovin, J.-O. (1989) The structure of magnesium-aluminium ludwigite, Mg2.11Al0.31Fe0.53Ti0.05Sb0.01BO5, a combined single crystal X-ray and HREM study. Zeitschrift für Kristallographie, 187, 201–211.CrossRefGoogle Scholar
Norrestam, R., Kritikos, M., Nielsen, K., Søtofte, I. and Thorup, N. (1994) Structural characterization of two synthetic Ni-ludwigites, and some semiempirical EHTB calculations on the ludwigite structure type. Journal of Solid State Chemistry, 111, 217–223.CrossRefGoogle Scholar
Pasero, M. (2024) The New IMA List of Minerals. International Mineralogical Association. Commission on new minerals, nomenclature and classification (IMA-CNMNC). http://cnmnc.units.it/.Google Scholar
Pekov, I.V., Vakhrusheva, N.V., Zubkova, N.V., Yapaskurt, V.O., Shelukhina, Y.S., Erokhin, Y.V., Bulakh, M.O., Britvin, S.N. and Pushcharovsky, D.Y. (2021) Savelievaite, IMA 2021–051. CNMNC Newsletter 63. Mineralogical Magazine, 85, 910–915.Google Scholar
Reznitskii, L., Clark, C.M., Hawthorne, F.C., Grice, J.D., Skogby, H., Hålenius, U. and Bosi, F. (2014) Chromo-alumino-povondraite, NaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup. American Mineralogist, 99, 1767–1773.CrossRefGoogle Scholar
Rigaku Oxford Diffraction (2018) CrysAlisPro Software System, v. 1.171.39.46, Rigaku Corporation, Oxford, UK.Google Scholar
Rumyantseva, E.V. (1983) Chromdravite, a new mineral. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 112, 222–226 [in Russian].Google Scholar
Savelieva, G.N., Batanova, V.G., Kuz'min, D.V. and Sobolev, A.V. (2015) Composition of minerals in mantle peridotites as proxy of ore-forming processes in the mantle: Evidence from ophiolites in the Voykar-Synya and Kempirsai Massifs. Lithology and Mineral Resources, 50, 80–91.CrossRefGoogle Scholar
Sheldrick, G.M. (2015) Crystal structure refinement with SHELXL. Acta Crystallographica, C71, 3–8.Google Scholar
Takéuchi, Y. and Kogure, T. (1992) The structure type of ludwigite. Zeitschrift für Kristallographie, 200, 161–167.CrossRefGoogle Scholar
Takéuchi, Y., Watanabé, T. and Ito, T. (1950) The crystal structures of warwickite, ludwigite and pinakiolite. Acta Crystallographica, 3, 98–107.CrossRefGoogle Scholar
Tolkanov, O.A., Chernobrovin, V.P., Muftakhov, V.A., Khvorov, P.V. and Rechkalova, V.A. (2000) Chromium-bearing ludwigite from chromium ores of the Volchiegorskoe deposit – the first find in Russia. Uralian Geological Journal, 4, 155–161 [in Russian].Google Scholar
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