Features of the composition and structural transformations of manganese minerals of the lake Bol’shoe Miassovo (South Ural)

• Published in: Journal of structural chemistry 2014-07, Vol.55 (4), p.764-770
• Main Authors: Palchik, N. A., Moroz, T. N., Grigorieva, T. N.
• Format: Article
• Language: English
• Subjects: 2013; Atomic; Atomic/Molecular Structure and Spectra; Chemistry; Chemistry and Materials Science; Inorganic Chemistry; Molecular; Novosibirsk; Optical and Plasma Physics; Physical Chemistry; Proceedings of the Conference “Methods for Studying the Composition and Structure of Functional Materials,” October 21–25; Solid State Physics
• ISSN: 0022-4766; 1573-8779
• DOI: 10.1134/S0022476614040271

The mineral and microelement composition of natural manganese minerals from iron-manganese concretions of the Bol’shoe Miassovo lake (South Ural) is investigated. The structural transformations of the samples under the effect of different temperatures are studied. Apart from layered 9.6 Å and 7.2 Å structures of manganese minerals the lake samples often contain various manganese-containing carbonates. For carbonate minerals by IR spectroscopy the dependence of the wavenumbers of ν 2 and ν 4 vibrations of the CO 3 group on the mineral composition is analyzed. The composition of macro- and microelements of iron-manganese concretions of Bol’shoe Miassovo lake varies in wide ranges not only in different samples, but also in different parts of the same sample. An analysis of the microstructure of lake manganese concretions revealed their biomorphic nature that is exhibited in globe-shaped to filament organic bacterial forms.