Fluorite on Sphalerite, Rosiclare Level, Minerva No. 1 Mine, Ozark-Mahoning Company, Cave-in-Rock District, Southern Illinois, Mined c. 1992, ex. Shorty Millikan, Ron Roberts Collection FS-18, Small Cabinet 3.5 x 6.0 x 10.0 cm, $160. Online 5/11.
Combination of light blue transparent fluorite and chocolate brown sphalerite. Note: one fluorite crystal has a bright white barite inclusion - a classic occurrence from the Minerva No. 1 Mine. In very good condition.