najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2022-13-5-539-545najo-267Research ArticleСтатьиTransformation of siderite in the zone of hypergenesisFedorovP. P.ppfedorov@yandex.ruNovikovI. A.ivan.a.novikov@gmail.comVoronovV. V.voronov@lst.gpi.ruBadyanovaL. V.badyanova.lubov@gmail.comKuznetsovS. V.kouznetzovsv@gmail.comChernovaE. V.e-chernova@yandex.ruProkhorov General Physics Institute of the Russian Academy of SciencesRussian Federation202206062025135539545Copyright © Fedorov P.P., Novikov I.A., Voronov V.V., Badyanova L.V., Kuznetsov S.V., Chernova E.V., 20252025Fedorov P.P., Novikov I.A., Voronov V.V., Badyanova L.V., Kuznetsov S.V., Chernova E.V.Fedorov P.P., Novikov I.A., Voronov V.V., Badyanova L.V., Kuznetsov S.V., Chernova E.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/267

The structure of siderite aggregates and its weathering products from the Ruza deposit, Moscow Region, has been studied by X-ray phase analysis and electron microscopy. The initial siderite is a dense FeCO3 aggregate of micron-sized grains. The nodules are covered with an ocher weathered crust, the color intensity of which varies from light yellow to brown-black. A successive replacement of siderite by FeOOH goethite and lepidocrocite was revealed. It is accompanied by a sharp decrease in volume ( ∼ 30 %) and the formation of a microporous structure.

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