Abstract
Single crystals of “malakhovite” (an anthropogenic silico-oxide from burnt dumps of the Chelyabinsk coal basin; sp. gr. P\(\bar {1}\), a = 10.555(4) Å, b = 10.928(3) Å, c = 9.059(3) Å, α = 106.338(12)°, β = 95.87(7)°, γ = 124.40(2)°, V = 781.0(5) Å3, Z = 1, R1 = 0.0378 have been investigated by electron-probe microanalysis, Raman spectroscopy, and X-ray diffraction analysis. The idealized formula of the mineral is Ca4(Fe\(_{{8.56}}^{{3 + }}\)Mg1.72Ca0.82Fe\(_{{0.55}}^{{2 + }}\)Mn0.22Ti0.13)Σ12.00(Fe\(_{{6.48}}^{{3 + }}\)Al2.82Si2.71)Σ12.01O40. It is shown that malakhovite is not only chemical but also crystal chemical anthropogenic analogue of khesinite (Ca4Mg2Fe\(_{{10}}^{{3 + }}\)O4Fe\(_{{10}}^{{3 + }}\)Si2O36). The relationships between the malakhovite and the minerals from the dorrite–khesinite series of the rhönite group in the sapphirine supergroup are discussed.
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ACKNOWLEDGMENTS
This study was performed using equipment of the Resource Centers “Methods of X-Ray Diffraction Analysis” and “Geomodel’" of the Scientific Park of St. Petersburg State University.
Funding
This study was supported by the Russian Foundation for Basic Research (project no. 19-05-00628) in the part concerning the electron-probe microanalysis, Raman spectroscopy, and crystal chemical analysis and by grant NSh-2526.2020.5 for Support of Leading Scientific Schools of the Russian Federation in the part concerning the XRD analysis.
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Translated by Yu. Sin’kov
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Zolotarev, A.A., Krivovichev, S.V., Avdontceva, M.S. et al. Crystal Chemistry of “Malakhovite,” an Anthropogenic Analog of Khesinite from Burnt Dumps of the Chelyabinsk Coal Basin (South Urals). Crystallogr. Rep. 66, 66–75 (2021). https://doi.org/10.1134/S106377452101020X
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DOI: https://doi.org/10.1134/S106377452101020X