Characteristics of nsutite(γ-MnO_2)in Goriajhar manganese deposit, Gangpur group, India
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The occurrence of nsutite and manganoan nsutite is reported for the first time from Goriajhar manganese deposit in Gangpur group of rocks, India. Detailed mineralogic and geochemical characteristics of these phases are described. Mn<sup>3+</sup> rather than Mn<sup>2+</sup> is found to coexist with Mn<sup>4+</sup> ion, the general formula being (Mn<sup>3+</sup>, Mn<sup>4+</sup>) (O, OH)<sub>2</sub>. These are formed from the host gonditic rocks through oxidation and precipitation processes under supergene enrichment condition.
- Journal of Mineralogical and Petrological Sciences
Journal of Mineralogical and Petrological Sciences 90(8), 280-287, 1995-08-05
Japan Association of Mineralogical Sciences