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Mineralogical and Geochemical Characterization of Asbestiform Todorokite, Birnessite, and Ranciéite, and Their host Mn-Rich Deposits from Serra D’Aiello (Southern Italy)

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Department of Biology, Ecology and Earth Sciences, University of Calabria, Via Pietro Bucci, 87036 Rende, CS, Italy
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E3 (Environment, Earth, Engineering) soc.coop. (University of Calabria), 87036 Rende, CS, Italy
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Authors to whom correspondence should be addressed.
Fibers 2020, 8(2), 9; https://doi.org/10.3390/fib8020009 (registering DOI)
Received: 8 December 2019 / Revised: 20 January 2020 / Accepted: 26 January 2020 / Published: 28 January 2020
Manganese ores, especially the oxyhydroxides in their different forms, are the dominant Mn-bearing minerals that occur in marine and terrestrial environments, where they are typically found as poorly crystalline and intermixed phases. Mn oxyhydroxides have a huge range of industrial applications and are able to exert a strong control on the mobility of trace metals. This paper reports the results of a detailed study on the Mn oxyhydroxides occurring in the manganiferous deposit outcropping in the Messinian sediments from Serra D’Aiello (Southern Italy). Nine Mn samples were characterized in detail using X-ray powder diffraction (XRPD), differential scanning calorimetry (DSC), thermogravimetry (TG), transmission electron microscopy combined with energy dispersive spectrometry (TEM/EDS), and X-ray fluorescence (XRF). The results indicated that the Mn deposit included the oxyhydroxide mineral species birnessite, todorokite, and rancièite. The size, morphology, and chemical composition of Mn oxyhydroxide samples were investigated in order to define their impact on the environment and human health. Todorokite displayed asbestiform shapes and could disperse fibers of breathable size in the air. Furthermore, since in-depth characterization of minerals within Mn deposits may be the first step toward understanding the genetic processes of manganese deposits, hypotheses about the genesis of the Mn oxyhydroxide deposits were discussed. View Full-Text
Keywords: Mn oxyhydroxides; todorokite; rancièite; birnessite; asbestiform; human health Mn oxyhydroxides; todorokite; rancièite; birnessite; asbestiform; human health
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MDPI and ACS Style

Bloise, A.; Miriello, D.; De Rosa, R.; Vespasiano, G.; Fuoco, I.; De Luca, R.; Barrese, E.; Apollaro, C. Mineralogical and Geochemical Characterization of Asbestiform Todorokite, Birnessite, and Ranciéite, and Their host Mn-Rich Deposits from Serra D’Aiello (Southern Italy). Fibers 2020, 8, 9.

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