硫酸盐类晶体中[SO_4]~(2-)四面体的结晶方位与晶体的形貌

本文从硫酸盐类晶体中负离子配位多面体的结晶方位和相互联结的稳定性出发，探讨了硫酸盐类晶体中SO4]2-结晶方位与晶体结晶形貌之间的关系;认为SO4]2-四面体与金属阳离子（Ba2 、Ca2 、Mg2 …）结合时，由于晶体结构和生长条件（如温度、过饱和度等）的不同，在晶体各族晶面上的叠合速率和取向不同;晶体的结晶形貌迥然有别.晶体的结晶形貌与SO4]2-四面体在晶体中的结晶方位密切相关，四面体的面和棱的法线（L2）所对向的晶面，生长速率慢，顽强显露，均属晶体的板面;四面体的顶角所指向的晶面，生长速率快，显露面积小，经常消失.

Relationship Between the Orientation of Tetrahedral [SO_4]~(2-) in Sulfate Crystals and Their Morphology

The relationship between the orientation of tetrahedral SO4]2- in sulfate crystals such as barite,anhydrite, epsomite and jarosite and their morphology was studied from the standpoint of crystal chemistry,and the formation inechanisin of their morphology was analysed according to the structural orientation of tetrahedral SO4]2- and the bonding energy between SO4]2- and metal ions M2 ] during growth. It was found that the inorphology ofsulfates is related to the orientation of tetrahedral SO4]2- in the crystal,i.e., the faces, the edges and faces of the tetrahedra normal to, are expected to grow slowly and observed in final form; in contrast, the faces, the vextices of the tetrahedra pointing to, usually grow fast, and will disappear.