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Akopovaite, Li2Al4(OH)12(CO3)(H2O)3, a new Li member of the hydrotalcite supergroup from Turkestan Range, Kyrgyzstan

Published online by Cambridge University Press:  13 February 2020

Vladimir Yu. Karpenko
Affiliation:
Fersman Mineralogical Museum, Russian Academy of Science, Leninskiy prospect, 18-2, 119071, Moscow, Russia
Elena S. Zhitova
Affiliation:
Department of Crystallography, St. Petersburg State University, University Emb., 7/9, St. Petersburg, 119034, Russia Institute of Volcanology and Seismology, Russian Academy of Sciences, Piip blvd., 9, Petropavlovsk-Kamchatsky, 683006, Russia
Leonid A. Pautov
Affiliation:
Fersman Mineralogical Museum, Russian Academy of Science, Leninskiy prospect, 18-2, 119071, Moscow, Russia Institute of Mineralogy, Miass, Chelyabinskaya obl., 456301, Russia
Atali A. Agakhanov
Affiliation:
Fersman Mineralogical Museum, Russian Academy of Science, Leninskiy prospect, 18-2, 119071, Moscow, Russia
Oleg I. Siidra
Affiliation:
Department of Crystallography, St. Petersburg State University, University Emb., 7/9, St. Petersburg, 119034, Russia Kola Science Center, Russian Academy of Sciences, Apatity, Murmansk Region, 184200 Russia, 683006, Russia
Maria G. Krzhizhanovskaya
Affiliation:
Department of Crystallography, St. Petersburg State University, University Emb., 7/9, St. Petersburg, 119034, Russia
Victor A. Rassulov
Affiliation:
Fedorovskii Institute of Mineral Raw Materials, Staromonetny per., 31, Moscow, 119017, Russia
Vladimir N. Bocharov
Affiliation:
Geomodel Resource Center, St. Petersburg State University, University Emb., 7/9, St. Petersburg, 199034, Russia
Corresponding
E-mail address:

Abstract

Akopovaite, ideally Li2Al4(OH)12(CO3)(H2O)3, is a new hydrotalcite-supergroup mineral from the Karasu–Karavshinskoye Sn deposit, Turkestan Range, Kyrgyzstan. It occurs as white or pale yellowish rosette-like aggregates that are composed of tiny curved plates up to 20–30 μm. Akopovaite is associated with gibbsite, quartz, albite, microcline, muscovite, montebrasite, siderite, schorl and birnessite-like Fe–Mn oxides. Akopovaite has a perfect cleavage along {001}, the mineral is transparent and very soft (VHN = 24 that corresponds to Mohs hardness of ca. 1). Dmeas = 2.12(2) g/cm3 and Dcalc = 2.106 g/cm3. The Raman spectra contain bands of carbonate groups and bands of O–H stretching vibrations. The chemical composition (wt.%, electron microprobe for Al and Fe; ICP-OES for Li; CHN method for CO2 and H2O) is Li2O 6.43, Al2O3 45.79, Fe2O3 0.27, CO2 10.09, H2O 36.1, total 98.68. The empirical formula based on (Li + Al + Fe) = 6 apfu is Li1.94(Al4.05Fe0.02)Σ4.07(OH)12(CO3)1.03(H2O)3.03. The crystal structure was refined by the Rietveld method with RB = 0.006 and Rwp = 0.014. Akopovaite is monoclinic, C2/m, a = 5.0953(6), b = 8.877(1), c = 7.806(1) Å, β = 102.572(6)°, V = 344.61(8) Å3 and Z = 1. The polytype should be denoted as 1M. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 7.66(100)(001), 4.397(27)(020), 3.821(45)(002,021), 2.4881(27)(200), 2.2273(16)(201) and 1.9027(18)(202). Akopovaite is the first naturally occurring hydrotalcite-supergroup carbonate species of Al and Li; its synthetic analogue is known.

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Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2020

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Footnotes

Associate Editor: Koichi Momma

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