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Saranovskite, SrCaFe2+2(Cr4Ti2)Ti12O38, a new crichtonite-group mineral

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Abstract

The new crichtonite-group mineral saranovskite, ideally SrCaFe2+2(Cr4Ti2)Ti12O38, was discovered in the Glavnoe Saranovskoe deposit, Middle Urals, Russia, and named after the type locality. The associated minerals are chromite, Cr-bearing clinochlore, and calcite. Saranovskite forms black crude equant crystals about 2 mm across. The lustre is submetallic, and the streak is brownish-gray. Cleavage is not observed. The Mohs hardness is 6. Density calculated using the empirical formula is equal to 4.501 g cm–3. The reflectance spectra in visible range are given. The IR spectrum shows the absence of H-, B- and C-bearing groups. The Raman spectrum of saranovskite confirms the absence of H-bearing groups and indicates a rather high degree of ordering of Ti4+ and lower-valence cations. The chemical composition of saranovskite is (wt.%; electron microprobe, total iron apportioned between FeO and Fe2O3 taking into account charge balance): MgO 2.01, CaO 1.43, MnO 0.21, FeO 8.14, SrO 3.27, BaO 2.18, Al2O3 0.53, Sc2O3 0.69, Cr2O3 10.27, Fe2O3 2.19, Y2O3 1.56, La2O3 0.94, Ce2O3 0.91, Pr2O3 0.14, Nd2O3 0.35, TiO2 64.25, ZrO2 0.58, total 99.65. The crystal chemical formula of saranovskite is (Sr0.55Ba0.25Ln0.10Ca0.10)(Ca0.36Y0.25Ln0.16Fe2+0.08Zr0.10Mn0.05) (Fe2+1.12Mg0.88)(Cr3+2.34Ti2.28Fe2+0.91Fe3+0.11Al0.18Sc3+0.18)(Ti5.82Fe3+0.18)Ti6.0O38. The idealized formula is SrCaFe2+2(Cr4Ti2)Ti12O38. The crystal structure was determined using single-crystal X-ray diffraction data and refined to R = 0.0243. The new mineral is isostructural to other crichtonite-group members. Saranovskite is trigonal, space group R\(\overline{3}\), with a = 10.3553(2) Å, c = 20.7301(4) Å, V = 1925.12(8) Å3 and Z = 3. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 3.398 (75) (024), 2.881 (100) (– 126), 2.842 (65) (– 234), 2.247 (67) (– 144). 2.137 (76) (– 345), 1.799 (63) (– 348), 1.597 (72) (– 1.4.10, 152), 1.439 (76) (520).

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Acknowledgements

The authors are grateful to Radek Škoda and an anonymous reviewer for valuable comments. This work was performed in accordance with the state task, state registration no. AAA-A19-119092390076-7 (mineralogical study, single crystal X-ray analysis, and IR spectroscopy) and was partly supported by Lomonosov Moscow State University Program of Development (Raman spectroscopy). The authors thank the SPbSU X-Ray Diffraction Resource Center and Center for Molecule Composition Studies of INEOS RAS for instrumental support.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Moscow Region, Chernogolovka, 142432, Russia

    Nikita V. Chukanov & Olga N. Kazheva

  2. Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991, Russia

    Nikita V. Chukanov, Igor V. Pekov & Vasiliy D. Shcherbakov

  3. FSRC “Crystallography and Photonics”, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia

    Ramiza K. Rastsvetaeva

  4. Institute of Geology and Geochemistry, of Urals Branch of Russian Academy of Sciences, Vonsovsky Street 15, Yekaterinburg, 620015, Russia

    Oleg K. Ivanov

  5. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygina Str. 19, 119991, Moscow, Russia

    Igor V. Pekov

  6. Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 8-2, Moscow, 119071, Russia

    Atali A. Agakhanov

  7. Institute of Experimental Mineralogy, Russian Academy of Sciences, Moscow region, Chernogolovka, 142432, Russia

    Konstantin V. Van

  8. Department of Crystallography, Institute of Earth Sciences, Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034, Saint Petersburg, Russia

    Sergey N. Britvin

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  1. Nikita V. Chukanov
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Correspondence to Nikita V. Chukanov.

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Oleg K. Ivanov deceased 01 February 2020.

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Chukanov, N.V., Rastsvetaeva, R.K., Kazheva, O.N. et al. Saranovskite, SrCaFe2+2(Cr4Ti2)Ti12O38, a new crichtonite-group mineral. Phys Chem Minerals 47, 49 (2020). https://doi.org/10.1007/s00269-020-01119-1

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