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The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part II. Radekškodaite-(La), (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekškodaite-(Ce), (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3, two new minerals with a novel structure-type belonging to the epidote–törnebohmite polysomatic series

Published online by Cambridge University Press:  24 August 2020

Anatoly V. Kasatkin
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia
Natalia V. Zubkova
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
Igor V. Pekov
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygina str. 19, 119991 Moscow, Russia
Nikita V. Chukanov
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow region, Russia
Dmitriy A. Ksenofontov
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
Atali A. Agakhanov
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia
Dmitriy I. Belakovskiy
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia
Yury S. Polekhovsky
Affiliation:
Institute of Earth Sciences, St Petersburg State University, University Embankment 7/9, 199034 St Petersburg, Russia
Aleksey M. Kuznetsov
Affiliation:
Oktyabrskaya str., 5-337, 454071 Chelyabinsk, Russia
Sergey N. Britvin
Affiliation:
Institute of Earth Sciences, St Petersburg State University, University Embankment 7/9, 199034 St Petersburg, Russia
Dmitry Yu. Pushcharovsky
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
Fabrizio Nestola
Affiliation:
Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, I-35131, Padova, Italy.
Corresponding

Abstract

Two new isostructural minerals radekškodaite-(La) (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekškodaite-(Ce) (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 were discovered in polymineralic nodules from the Mochalin Log REE deposit, South Urals, Russia. Radekškodaite-(La) is associated with allanite-(Ce), allanite-(La), bastnäsite-(Ce), bastnäsite-(La), ferriallanite-(Ce), ferriallanite-(La), ferriperbøeite-(La), fluorbritholite-(Ce), törnebohmite-(Ce) and törnebohmite-(La). Radekškodaite-(Ce) is associated with ancylite-(Ce), bastnäsite-(Ce), bastnäsite-(La), lanthanite-(La), perbøeite-(Ce) and törnebohmite-(Ce). The new minerals form isolated anhedral grains up to 0.35 × 0.75 mm [radekškodaite-(La)] and 1 mm × 2 mm [radekškodaite-(Ce)]. Both minerals are greenish-brown with vitreous lustre. Dcalc = 4.644 [radekškodaite-(La)] and 4.651 [radekškodaite-(Ce)] g cm–3. Both minerals are optically biaxial (+); radekškodaite-(La): α = 1.790(7), β = 1.798(5), γ = 1.825(8) and 2Vmeas = 60(10)°; radekškodaite-(Ce): α = 1.798(6), β = 1.806(6), γ = 1.833(8) and 2Vmeas = 65(10)°. Chemical data [wt.%, electron-microprobe; FeO:Fe2O3 by charge balance; H2O by stochiometry; radekškodaite-(La)/radekškodaite-(Ce)] are: CaO 3.40/2.74, La2O3 27.68/22.23, Ce2O3 20.39/24.30, Pr2O3 0.94/1.48, Nd2O3 1.71/3.18, ThO2 0.23/0.24, MgO 0.85/1.04, Al2O3 10.35/10.84, MnO 0.64/0.69, FeO 2.55/2.76, Fe2O3 3.12/2.57, TiO2 0.13/0.04, SiO2 26.03/26.10, F 0.10/0.09, H2O 1.62/1.63, –O=F –0.04/–0.04, total 99.70/99.89. The empirical formulae based on O28(OH,F)3 are: radekškodaite-(La): (Ca0.98Th0.01La2.75Ce2.01Nd0.16Pr0.09)Σ6.00(Al3.28Fe3+0.63Fe2+0.57Mg0.34Mn0.15Ti0.03)Σ5.00Si7.00O28[(OH)2.91F0.09]; radekškodaite-(Ce): (Ca0.79Mn0.16Th0.01Ce2.39La2.20Nd0.30Pr0.14)Σ5.99(Al3.43Fe2+0.62Fe3+0.52Mg0.42Ti0.01)Σ5.00Si7.00O28[(OH)2.92F0.08]. Both minerals are monoclinic, P21/m; the unit-cell parameters [radekškodaite-(La)/radekškodaite-(Ce)] are: a = 8.9604(3)/8.9702(4), b = 5.7268(2)/5.7044(2), c = 25.1128(10)/25.1642(13) Å, β = 116.627(5)/116.766(6)°, V = 1151.98(7)/1149.68(11) Å3 and Z = 2/2. The crystal structures are solved based on single-crystal X-ray diffraction data; R = 0.0554 [radekškodaite-(La)] and 0.0769 [radekškodaite-(Ce)]. Both minerals belong to the epidote–törnebohmite polysomatic series and represent first members of ET2-type: their structure consists of regular alternating modules, one slab of the epidote (E) structure and two slabs of törnebohmite (T). The rootname radekškodaite is given in honor of the Czech mineralogist Radek Škoda (born 1979), Associate Professor at Masaryk University, Brno, Czech Republic. The suffix-modifier -(La) or -(Ce) indicates the predominance of La or Ce among REE in the mineral.

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Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Deceased 28 September 2018.

Associate Editor: Irina O Galuskina

References

Agilent Technologies (2014) CrysAlisPro Software system, version 1.171.37.34. Agilent Technologies UK Ltd, Oxford, UK.Google Scholar
Allaz, J., Raschke, M.B., Persson, P.M. and Stern, C.R. (2015) Age, petrochemistry, and origin of a REE-rich mineralization in the Longs Peak-St. Vrain batholith, near Jamestown, Colorado (USA). American Mineralogist, 100, 21232140.CrossRefGoogle Scholar
Andersson, U.B. (2004) The Bastnäs-type REE-mineralisations in north-western Bergslagen, Sweden. Sveriges Geologiska Undersökning Rapporter and Meddelanden, 119, 34.Google Scholar
Andò, S. and Garzanti, E. (2014) Raman spectroscopy in heavy-mineral studies. Geological Society of London, Special Publications, 386, 395412.CrossRefGoogle Scholar
Bindi, L., Holstam, D., Fantappiè, G., Andersson, U.B. and Bonazzi, P. (2018) Ferriperbøeite-(Ce), [CaCe3]Σ=4[Fe3+Al2Fe2+]Σ=4[Si2O7][SiO4]3O(OH)2, a new member of the polysomatic epidote–törnebohmite series from the Nya Bastnäs Fe–Cu–REE deposit, Sweden. European Journal of Mineralogy, 30, 537544.CrossRefGoogle Scholar
Bonazzi, P., Bindi, L. and Parodi, G. (2003) Gatelite-(Ce), a new REE-bearing mineral from Trimouns, French Pyrenees: crystal structure and polysomatic relationships with epidote and törnebohmite-(Ce). American Mineralogist, 88, 223228.CrossRefGoogle Scholar
Bonazzi, P., Lepore, G.O., Bindi, L., Chopin, C., Husdal, T. and Medenbach, O. (2014) Perbøeite-(Ce) and alnaperbøeite-(Ce), two new members of the epidote–törnebohmite polysomatic series: Chemistry, structure, dehydrogenation, and clue for a sodian epidote end-member. American Mineralogist, 99, 157169.CrossRefGoogle Scholar
Bonazzi, P., Holstam, D. and Bindi, L. (2019) Gatelite-supergroup minerals: recommended nomenclature and review. European Journal of Mineralogy, 31, 173181.CrossRefGoogle Scholar
Breiter, K., Čopjaková, R. and Škoda, R. (2009) The involvement of F, CO2, and As in the alteration of Zr–Th–REE-bearing accessory minerals in the Hora Svaté Kateřiny A-type granite, Czech Republic. The Canadian Mineralogist, 47, 13751398.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 Obshchestva, 146, 104107 [in Russian].Google Scholar
Čopjaková, R., Škoda, R., Vašinová Galiová, M. and Novák, M. (2013) Distributions of Y plus REE and Sc in tourmaline and their implications for the melt evolution; examples from NYF pegmatites of the Třebíč Pluton, Moldanubian Zone, Czech Republic. Journal of Geosciences, 58, 113131.CrossRefGoogle Scholar
Čopjaková, R., Škoda, R., Vašinová Galiová, M., Novák, M. and Cempírek, J. (2015) Sc- and REE-rich tourmaline replaced by Sc-rich REE-bearing epidote-group mineral from the mixed (NYF plus LCT) Kracovice pegmatite (Moldanubian Zone, Czech Republic). American Mineralogist, 100, 14341451.CrossRefGoogle Scholar
Ferraris, G. and Ivaldi, G. (1988) Bond valence vs. bond length in O⋅⋅⋅O hydrogen bonds. Acta Crystallographica, B44, 341344.CrossRefGoogle Scholar
Finger, F., Broska, I., Roberts, M. P., Schermaier, A. (1998) Replacement of primary monazite by apatite-allanite-epidote coronas in an amphibolite facies granite gneiss from the eastern Alps. American Mineralogist, 83, 248258.CrossRefGoogle Scholar
Gagné, O.C. and Hawthorne, F.C. (2015) Comprehensive derivation of bond-valence parameters for ion pairs involving oxygen. Acta Crystallographica, B71, 562578.Google Scholar
Holtstam, D., Kolitsch, U. and Andersson, U.B. (2005) Västmanlandite-(Ce) – a new lanthanide- and F-bearing sorosilicate mineral from Västmanland, Sweden: description, crystal structure, and relation to gatelite-(Ce). European Journal of Mineralogy, 17, 129141.CrossRefGoogle Scholar
Hönig, S., Čopjaková, R., Škoda, R., Novák, M., Dolejš, D., Leichmann, J. and Vašinová Galiová, M. (2014) Garnet as a major carrier of the Y and REE in the granitic rocks: An example from the layered anorogenic granite in the Brno Batholith, Czech Republic. American Mineralogist, 99, 19221941.CrossRefGoogle Scholar
Kasatkin, A.V., Pekov, I.V., Zubkova, N.V., Chukanov, N.V., Polekhovsky, Y.S., Belakovskiy, D.I., Ksenofontov, D.A., Agakhanov, A.A., Kuznetsov, A.M. and Pushcharovsky, D.Y. (2018) Radekškodaite-(La), IMA 2018-107. CNMNC Newsletter No. 46, December 2018, page 1377; Mineralogical Magazine, 82, 13691379.Google Scholar
Kasatkin, A.V., Zubkova, N.V., Pekov, I.V., Chukanov, N.V., Škoda, R., Agakhanov, A.A., Belakovskiy, D.I. and Pushcharovsky, D.Y. (2019a) Alexkuznetsovite-(La), IMA 2019–081. CNMNC Newsletter No.52. Mineralogical Magazine, 83, 887893.Google Scholar
Kasatkin, A.V., Zubkova, N.V., Pekov, I.V., Chukanov, N.V., Škoda, R., Nestola, F., Agakhanov, A.A., Belakovskiy, D.I. and Kuznetsov, A.M. (2019b) Radekškodaite-(Ce), IMA 2019-042. CNMNC Newsletter No. 51; CNMNC Newsletter No. 51; Mineralogical Magazine, 83, 757761Google Scholar
Kasatkin, A.V., Zubkova, N.V., Pekov, I.V., Chukanov, N.V., Škoda, R., Agakhanov, A.A., Belakovskiy, D.I. and Pushcharovsky, D.Y. (2020a) Alexkuznetsovite-(Ce), IMA 2019–118. CNMNC Newsletter No. 54. Mineralogical Magazine, 84, 359365.Google Scholar
Kasatkin, A.V., Zubkova, N.V., Pekov, I.V., Chukanov, N.V., Škoda, R., Polekhovsky, Y.S., Agakhanov, A.A., Belakovskiy, D.I., Kuznetsov, A.M., Britvin, S.N. and Yu, Pushcharovsky D.. (2020b) The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part I. New gatelite-group minerals ferriperbøeite-(La), (CaLa3)(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2, and perbøeite-(La), (CaLa3)(Al3Fe2+)[Si2O7][SiO4]3O(OH)2. Mineralogical Magazine, 84, 593607.CrossRefGoogle Scholar
Mandarino, J.A. (1981) The Gladstone-Dale relationship. IV. The compatibility concept and its 209 application. The Canadian Mineralogist, 41, 9891002.Google Scholar
McDonough, W.F. and Sun, S. (1995) The composition of the Earth. Chemical Geology, 120, 223253.CrossRefGoogle Scholar
Plášil, J. and Škoda, R. (2017) Crystal structure of the (REE)–uranyl carbonate mineral shabaite-(Nd). Journal of Geosciences, 62, 97105.CrossRefGoogle Scholar
Plášil, J., Petříček, V., Locock, A.J., Škoda, R. and Burns, P.C. (2018) The (3 + 3) commensurately modulated structure of the uranyl silicate mineral swamboite-(Nd), Nd0.333[(UO2)(SiO3OH)](H2O)2.41 . Zeitschrift für Kristallographie-Crystalline Materials, 233, 223231.CrossRefGoogle Scholar
Sheldrick, G.M. (2008) A short history of SHELX. Acta Crystallographica, A64, 112122.CrossRefGoogle Scholar
Sheldrick, G.M. (2015) Crystal structure refinement with SHELXL. Acta Crystallographica, C71, 38.Google Scholar
Shen, J. and Moore, P.B. (1982) Törnebohmite, RE2Al(OH)[SiO4]2: crystal structure and genealogy of RE(III)Si(IV) ↔ Ca(II)P(V) isomorphism. American Mineralogist, 67, 10211028.Google Scholar
Škoda, R. and Novák, M. (2007) Y,REE,Nb,Ta,Ti-oxide (AB2O6) minerals from REL-REE euxenite-subtype pegmatites of the Třebíč Pluton, Czech Republic; substitutions and fractionation trends. Lithos, 95, 4357.CrossRefGoogle Scholar
Škoda, R., Novák, M. and Cícha, J. (2011) Uranium-niobium-rich alteration products after “pisekite”, an intimate mixture of Y, REE, Nb, Ta, Ti-oxide minerals from the Obrazek I pegmatite, Pisek, Czech Republic. Journal of Geosciences, 56, 317325.Google Scholar
Škoda, R., Cempírek, J., Filip, J., Novák, M., Veselovský, F. and Čtvrtlík, R. (2012) Allanite-(Nd), CaNdAl2Fe2+(SiO4)(Si2O7)O(OH), a new mineral from Åskagen, Sweden. American Mineralogist, 97, 983988.CrossRefGoogle Scholar
Škoda, R., Plášil, J., Jonsson, E., Čopjaková, R., Langhof, J. and Galiová Vašinová, M. (2015) Redefinition of thalénite-(Y) and discreditation of fluorthalénite-(Y): A re-investigation of type material from the Österby pegmatite, Dalarna, Sweden, and from additional localities. Mineralogical Magazine, 79, 965983.CrossRefGoogle Scholar
Škoda, R., Plášil, J., Čopjaková, R., Novák, M., Jonsson, E., Galiová Vašinová, M. and Holtstam, D. (2018) Gadolinite-(Nd), a new member of the gadolinite supergroup from Fe-REE deposits of Bastnäs-type, Sweden. Mineralogical Magazine, 82, 133145.CrossRefGoogle Scholar
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The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part II. Radekškodaite-(La), (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekškodaite-(Ce), (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3, two new minerals with a novel structure-type belonging to the epidote–törnebohmite polysomatic series
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The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part II. Radekškodaite-(La), (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekškodaite-(Ce), (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3, two new minerals with a novel structure-type belonging to the epidote–törnebohmite polysomatic series
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The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part II. Radekškodaite-(La), (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekškodaite-(Ce), (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3, two new minerals with a novel structure-type belonging to the epidote–törnebohmite polysomatic series
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