Calcite on Fluorite, Rosiclare Level, Minerva No. 1 Mine, Cave-in-Rock District, Southern Illinois, ex. Roy Smith Collection, Medium Cabinet 7.0 x 8.5 x 13.5 cm, $450. Online Dec. 14
A combination of "coontail" calcite and glassy pale yellow and purple zoned fluorite. Fluorite shows pronounced etching on reverse with spike-like protrusions caused by dissolution of barite. Classic Minerva No. 1 specimen. One fluorite shows edge chipping.