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An Aluminum–Magnesium Variety of Caryopilite from Goethite–Neotocite–Rhodochrosite Ores of the Mazul Manganese Deposit, Krasnoyarsk Krai

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Abstract

A variety of caryopilite enriched in Mg and Al from the goethite–neotocite–rhodochrosite ores of the Mazul manganese deposit in Krasnoyarsk Krai is described. The mineral occurs as sheaf-like and fibrous aggregates of fine-lamellar individuals intimately intergrown with goethite, hematite, rhodochrosite, and neotocite. The optical parameters of caryopilite are: Z = yellow, X = pale yellow, β ≈ 1.60, γ – α ≈ 0.010 – 0.015, and parallel extinction. The average chemical composition corresponds to the empirical formula (Mn1.95Mg1.61\({\text{Fe}}_{{0.63}}^{{2 + }}\)Al0.58◻0.23)5.00[(Si3.88Al0.12)4.00O10](OH)6, where ◻ is vacancy. The unusually high Mg concentration and elevated Al content allow identification of a new aluminum–magnesium variety of caryopilite. It replaces sedimentary neotocite at low temperatures. It is suggested that at increasing temperature this variety of caryopilite loses Mg and Al, which incorporate into Mg–Mn chlorite and spessartine.

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ACKNOWLEDGMENTS

The equipment of the Research Centers GEOMODEL, X-ray Diffraction Studies and Microscopy and Microanalysis at St. Petersburg State University were used in this study.

Funding

This study has been supported by the Russian Foundation for Basic Research (project no. 16-05-00227). Field work was carried out under theme no. AAAA-А19-119061790049-3.

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Authors and Affiliations

  1. Institute of Geosciences, Saint Petersburg State University, 119034, Saint Petersburg, Russia

    A. I. Brusnitsyn

  2. Institute of Mineralogy, Ural Branch, Russian Academy of Sciences, 456317, Miass, Chelyabinsk oblast, Russia

    E. V. Belogub & I. G. Zhukov

  3. Research Center for X-ray Diffraction Studies, Saint Petersburg State University, 199155, Saint Petersburg, Russia

    N. V. Platonova

  4. Research Centre for Geo-Environmental Research and Modeling (GEOMODEL), Saint Petersburg State University, 198504, Saint Petersburg, Russia

    V. V. Shilovskikh

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  1. A. I. Brusnitsyn
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  2. E. V. Belogub
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  3. N. V. Platonova
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  4. V. V. Shilovskikh
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  5. I. G. Zhukov
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Correspondence to A. I. Brusnitsyn.

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Translated by I. Baksheev

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Brusnitsyn, A.I., Belogub, E.V., Platonova, N.V. et al. An Aluminum–Magnesium Variety of Caryopilite from Goethite–Neotocite–Rhodochrosite Ores of the Mazul Manganese Deposit, Krasnoyarsk Krai. Geol. Ore Deposits 61, 818–826 (2019). https://doi.org/10.1134/S1075701519080026

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