Sphalerite after Fluorite, Rosiclare Level Denton Mine, Ozark-Mahoning Company, Harris Creek District, Southern Illinois, Mined August 1990, Koster Collection, Miniature 3.0 x 5.0 x 7.5 cm, $250. Online 03/07. SOLD.
An exceedingly rare example of sphalerite epimorph after fluorite. The main fluorite crystal replaced by lustrous deep brown sphalerite measures 1.5 x 1.5 x 4 cm and projects up off remnant purple fluorite matrix. There are associated sphalerite casts after fluorite around this center-point crystal as well. Pristine condition. Mined August 1990. Sam & Ann Koster Collection. Entered into Ross C. Lillie database as RCL2577.