Characteristics of nsutite(γ-MnO_2)in Goriajhar manganese deposit, Gangpur group, India
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.
- 岩鉱 : 岩石鉱物鉱床学会誌 : journal of mineralogy, petrology and economic geology
岩鉱 : 岩石鉱物鉱床学会誌 : journal of mineralogy, petrology and economic geology 90(8), 280-287, 1995-08-05
Japan Association of Mineralogical Sciences