Fluorite with Hydrocarbon, Rosiclare Level, Cross-Cut Orebody, Minerva #1 Mine, Ozark-Mahoning Company, Cave-in-Rock District, Southern Illinois, Mined c. 1990, Tolonen Collection, Small Cabinet 3.5 x 5.5 x 8.0 cm, $650. Online 1/18. SOLD.
Transparent, zoned yellow, purple and light blue fluorite with hydrocarbon inclusions localized on crystal surface edges. The inclusions are classic from this ore body but the aesthetic almost decorative nature is highly unusual. I cleaned the specimen in effective solvents and the hydrocarbons remained so are definitely within the crystals. A sharp and intriguing specimen from mining ca. 1990. Tolonen Collection. Tiny edge chips on several crystals.