Top-notch large single Fluorite crystal dusted with tiny Pyrites inside and out. This is absolutely classic for Illinois: superb luster, yellow core and purple to clear edges. Also, it is gemmier than you normally find from Illinois, especially for this size! There is a minor cleave in the rough lower corner, and the tiniest of dings in the upper corner. Neither makes any difference at all to the overall aesthetics, which are terrific.