Calcite on Fluorite, Rosiclare Level attr., Minerva No. 1 Mine, Minerva Oil Company, Cave-in-Rock District, Southern Illinois, Mined c. 1960's, ex. Roy Smith Collection, Miniature 1.5 x 6.4 x 7.5 cm, $650. Online Dec. 14
A superlative example of a fluorite "bird's nest". Not only is this a classic cast of fluorite after barite but the color is unique in my experience. Small cluster of calcites adds great interest and aesthetics. Note: Fluorite crystals are nicely modified by low angle tetrahexahedrons. A great miniature. In top condition.