【摘要】 云南白显锰矿产于中三叠统法郎组地层中,其主要矿石矿物是钡镁锰矿。矿物属沉积成因,结晶细微,局部呈沿c轴延长的细小柱状和纤维状。矿物点群2/m,常见单形:斜方柱{110}、平行双面{100}和{001}。晶胞参数:a₀=0.9758nm,b₀=0.2848nm,c₀=0.9640nm,β=88.98°,V=0.26786nm³,Z=1。矿物反射率为18.60～25.65,相对密度3.67,文中还列出了红外光谱和差热分析新资料。更多还原

【Abstract】 Baixian manganese deposit is found in the Middle Triassic stratum ( Falang formation) , in Yunnan Province of China. Its main mineral is todorokite. It is of sedimentary origin, degree of its metamorphism is lower, crystal size of minerals mainly is aphanitic and microaphanitic. The crystal forms are small prism and fibrous crystals with parallel C-axis. Its simple forms: rhombic prism{110}, parallelohedron{100}and{001}, point group: 2/m crystal constants: a0 = 0.9758nm, b0 = 0.2848nm, c0 = 0.9640nm, β = 88.98°, V = 0.26786nm3, Z=1. New data of differential thermal analysis and infrared absorption spectroscopic analysis are also given in this paper.更多还原