Mineralogical characterization of manganese oxide minerals of the Devonian Xialei manganese deposit

Niu, Sida, Zhao, Liqun, Lin, Xiaoju, Chen, Tong, Wang, Yingchao, Mo, Lingchao, Niu, Xianglong, Wu, Huaying, Zhang, Min, Huizenga, Jan Marten, and Long, Peng (2021) Mineralogical characterization of manganese oxide minerals of the Devonian Xialei manganese deposit. Minerals, 11. 1243.

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The Guangxi Zhuang Autonomous Region is an important manganese ore district in Southwest China, with manganese ore resource reserves accounting for 23% of the total manganese ore resource reserves in China. The Xialei manganese deposit (Daxin County, Guangxi) is the first super-large manganese deposit discovered in China. The Mn oxide in the supergene oxidation zone of the Xialei deposit was characterized using scanning electron microscopy (SEM), energy spectrometer (EDS), transmission electron microscopy (TEM, HRTEM), and X-ray diffraction analysis (XRD). The Mn oxides have a gray-black/steel-gray color, a semi-metallic-earthy luster, and appear as oolitic, pisolitic, banded, massive, and cellular textures. Scanning electron microscopy images show that the manganese oxide minerals are present as fine-spherical particles with an earthy surface. TEM and HRTEM indicate the presence of oriented bundled and staggered nanorods, and nanopores between the crystals. The Mn oxide ore can be classified into two textural types: (1) oolitic and pisolitic (often with annuli) Mn oxide, and (2) massive Mn oxide. Pyrolusite, cryptomelane, and hollandite are the main Mn oxide minerals. The potassium contents of cryptomelane and pyrolusite are discussed. The unit cell parameters of pyrolusite are refined.

Item ID: 70826
Item Type: Article (Research - C1)
ISSN: 2075-163X
Keywords: manganese oxide; Xialei Mn deposit; mineral composition; crystal structure; pyrolusite
Copyright Information: © 2021 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 (CC BY) license (https://creativecommons.org/licenses/by/4.0/)
Date Deposited: 30 Nov 2021 02:51
FoR Codes: 37 EARTH SCIENCES > 3705 Geology > 370505 Mineralogy and crystallography @ 100%
SEO Codes: 25 MINERAL RESOURCES (EXCL. ENERGY RESOURCES) > 2503 Mineral exploration > 250399 Mineral exploration not elsewhere classified @ 100%
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