A stain test for fluorite W. E. Ssnnp, Entc L. ClnlsoN,cNo Ins KHnor.usNnouNs Department of Geology, Uniuersity of South Carolina ... South Carolina 29208 Abstract Fluorite, as loose sand grains or in sawed slabs, can be stained using a simple procedure' The two basic steps consist of: (l ) coating the grains with calcium sulfate by reacting ...