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.