栃木県足利市馬坂産 Lithiophorite

概要

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Lithiophorite from Mazaka occurs as black dendrites growing on smoother fracture surfaces in massive chert and as the underlying impregnation in bedded chert that overlies a bed of nodular goethite partially coated by kaolinite and sericite. The wet chemical analysis of dendrite gave SiO_2 3.37,MnO_2 (total Mn) 52.43,Al_2O_3 21.52,Fe_2O_3 2.75,TiO_2 0.08,MgO 1.04,CaO 0.14,CuO 2.63,NiO 0.85,CoO 0.43,ZnO 0.36,Li_2O 0.61,Na_2O 0.67,K_2O 0.32,H_2O 12.80% (by difference), corresponding to Mn^<4+>_<0.99> (Al_<0.69>Li_<0.07>Fe^<3+>_<0.06>Cu_<0.05>Mg_<0.04>Na_<0.04>Ni_<0.02>Co_<0.01>Zn_<0.01>K_<0.01>)_<Σ1.00O>_<2.59>(OH)_<1.41>・0.47 H_2O on the basis of total metallic cation=2 after deducting SiO_2. The X-ray powder pattern is essentially identical with those of known lithiophorites and indexed on a monoclinic cell with a=5.018,b=2.904,c=9.585A, β=99.8°. The dendrites were formed by capilarity conveying the manganiferous material in a watery media from the underlying bedded chert impregnated by lithiophorite that had deposited in an open space as inferrable from the development of minute tablets.
国立科学博物館の論文
1984-06-22