Sphalerite on Fluorite, Butterknife Pod Denton Mine, Ozark-Mahoning Company, Harris Creek District, Southern Illinois, Mined ca. 1986, Koster Collection #00668, Medium Cabinet 6.0 x 6.5 x 6.8 cm, $250. Online 3/11. SOLD.
Richly zoned corner of yellow and light purple fluorite with abundant chalcopyrite inclusions. Associated adamantine black sphalerite with fine, well developed sharp faces one hoppered section of fluorite. Very tiny chip on one edge and tiny cleave off one corner. Mined ca. 1986. Sam & Ann Koster Collection #00668.