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Ferronigerite-2N1S is an iron, tin, alumino-hydroxide mineral that naturally occurs around sillimanite-quartz veins. Ferronigerite-2N1S belongs to the nigerite group, högbomite supergroup. The other constituents of the nigerite group are ferronigerite-6N6S, magnesionigerite-2N1S, magnesionigerite-6N6S, zinconigerite-2N1S and zinconigerite-6N6S.〔(Nigerite group on Mindat.org )〕 The ''2N1S'' ending stands for the nolanite and spinel structural layers.〔 Ferronigerite-2N1S was first discovered in the Kabba provence of central Nigeria in 1944; it was originally named Nigerite. Its name was later changed to nigerite-6H then to nigerite-6T and in 2003 ferronigertie-2N1S was approved by the International Mineralogical Association. ==Chemical composition== The general chemical formula of ferronigertie-2N1S is (Zn,Mg,Fe2+)(Sn,Zn)2(Al,Fe3+)12O22(OH)2〔(Ferronigerite-2N1S data on Webmineral )〕 or Sn(Fe,Mg)Al6O11(OH).〔(Ferronigerite-2N1S on Mindat.org )〕 Its percent composition is 50.91% Al2O3, 25.33% SnO2, 11.90% Fe2O3, 4.51% ZnO, 2.65% FeO, 1.57% H2O, 1.28% MgO, and less than 1% of PbO, SiO2, TiO2 and MnO. Due to its chemical composition, it is not susceptible to decomposition or solubility in acids. Ferronigerite-2N1S has also been found in some cases to have a lithium substitution for tin and titanium; this aids in charge balancing. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ferronigerite-2N1S」の詳細全文を読む スポンサード リンク
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