Relationship Between the Orientation of Tetrahedral [SO4]2- in Sulfate Crystals and Their Morphology
硫酸盐类晶体中[SO4]2-四面体的结晶方位与晶体的形貌

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 faees 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.