Britvinite, Pb15Mg9(Si10O28)(BO3)4(CO3)2(OH)12O2, a new mineral species from Långban, Sweden (original) (raw)

Abstract

Britvinite, a new mineral species, has been found in manganese ore at the Långban deposit, Bergslagen ore district, Filipstad, Värmland County, Sweden. Calcite, barytocalcite, brucite, cerussite, and hausmannite are associated minerals. Britvinite occurs as pale yellow to colorless transparent plates with a white streak up to 0.2 × 0.5 × 0.5 mm in size, which are flat parallel to {001}; the luster is adamantine. Thin lamellae are flexible, whereas thick ones are brittle; the Mohs hardness is 3. The cleavage is eminent parallel to {001}. The calculated density is 5.51 g/cm3. In the infrared spectrum of the new mineral, the bands of (OH)−, (CO3)2−, and (BO3)3− are recorded, whereas those corresponding to water molecules are absent. Britvinite is optically biaxial and negative, α = 1.896(2), β = 1.903(2), γ = 1.903(2), 2_V_meas = 20(10), Z_≈_c. Dispersion is strong, r<v. The chemical composition (electron microprobe; H2O determined with the Alimarin method, CO2, with selective sorption) is (wt %) 7.95 MgO, 71.92 PbO, 0.41 Al2O3, 12.77 SiO2, 2.2 H2O, 2.1 CO2, 2.67 B2O3 (calculated on the basis of structural data); total 100.02. The empirical formula calculated on the basis of 59 anions (O + OH) (Z = 1) is as follows: Pb14.75Mg9.03Si9.73Al0.37O30.76(BO3)3.51(CO3)2.18(OH)11.7. The simplified formula (Z = 2) is Pb7 + x Mg4.5(Si5O14)(BO3)2(CO3)(OH,O)7 (x < 0.5). The crystal structure of britvinite has been studied on a single crystal at 173 K; R = 0.0547. The new mineral is triclinic, space group P \( \bar 1 \); the unit-cell dimensions are a = 9.3409(8), b = 9.3597(7), c = 18.8333(14) Å, α = 80.365(6)°, β = 75.816(6)°, γ = 59.870(5)°, V = 1378.74(19) Å3. The structure consists of alternating TOT stacks (containing octahedral brucite-like and discontinuous tetrahedral (Si5O14)∞∞ layers) and multilayered [Pb7.1(OH)3.6(CO3)(BO3)1.75(SiO4)0.25]∞∞ blocks. The strongest reflections in the X-ray powder diffraction pattern [d, Å (I, %)(hkl)] are 18.1(100)(001), 3.39(30)(12\( \bar 3 \), 1\( \bar 1 \)4, 015), 3.02(90)(006, 130, 106, 2\( \bar 1 \)0, 1\( \bar 2 \)1), 2.698(70)(332, 134, 030, 1\( \overline {23} \)), 2.275(30)(008, 420, 424), 1.867(30)(446, 239, 2.1.10, 1\( \bar 2 \)8), 1.766(40)(151, 31\( \bar 7 \), 1\( \bar 4 \)0, 453, 542, 512, 4\( \bar 1 \)2), 1.519(40)(0.0.12). The mineral has been named in honor of Sergei Nikolaevich Britvin (b. 1965), a Russian mineralogist. The type material of britvinite is deposited in the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow. The registration number is 3458/1.

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Authors and Affiliations

1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia
   N. V. Chukanov
2. Faculty of Geology, Moscow State University, 119991, Moscow, Russia
   O. V. Yakubovich & I. V. Pekov
3. Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskii pr. 18, korp. 2, Moscow, 117901, Russia
   D. I. Belakovsky
4. Fachbereich Chemie, Philipps-Universität Marburg, Biegenstr. 10/12 am Pilgrimstein, 35037, Marburg, Germany
   W. Massa

Authors

1. N. V. Chukanov
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2. O. V. Yakubovich
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3. I. V. Pekov
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4. D. I. Belakovsky
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5. W. Massa
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Correspondence toN. V. Chukanov.

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Original Russian Text © N.V. Chukanov, O.V. Yakubovich, I.V. Pekov, D.I. Belakovsky, W. Massa, 2007, published in Zapiski Rossiiskogo Mineralogicheskogo Obshchestva, 2007, Pt CXXXVI, No. 6, pp. 18–25.

The new mineral britvinite and its name were accepted by the Commission on New Minerals and Mineral Names, Russian Mineralogical Society, June 7, 2006, and approved by the Commission on New Minerals and Mineral Names, International Mineralogical Association, October 17, 2006.

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Chukanov, N.V., Yakubovich, O.V., Pekov, I.V. et al. Britvinite, Pb15Mg9(Si10O28)(BO3)4(CO3)2(OH)12O2, a new mineral species from Långban, Sweden.Geol. Ore Deposits 50, 713–719 (2008). https://doi.org/10.1134/S1075701508080072

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• Received: 26 December 2006
• Published: 08 January 2009
• Issue Date: December 2008
• DOI: https://doi.org/10.1134/S1075701508080072

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