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. 2015 Feb 16;8(2):751–783. doi: 10.3390/ma8020751

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© 2015 by the authors;

licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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Typical morphology of different sulfides. (a) Type I oxy-sulfide; (b) Type II (+IV) eutectic MnS; (c) Type III regular MnS [49,50].