Fluorite with Calcite, Rosiclare Level attr., Minerva #1 Mine, Minerva Oil Company, Cave-in-Rock District, Southern Illinois, Mined 1973, Ron Roberts Collection F-120, Small Cabinet 4 x 7 x 9 cm, $350. Online September 14.
Mounded group of rich caramel brown fluorite with light purple edges and glassy luster. Strong fluorescence from copious inclusions of micro-hydrocarbons. Associated light brown discoidal calcite crystals. Ex: Tom Wiesner Collection #837-acquired in district April 12, 1973. Minor edge wear on a few crystals.