Fluorite Octahedron with Chalcopyrite, Rosiclare Level, Denton Mine, Ozark-Mahoning Company, Harris Creek District, Southern Illinois, Ron Roberts Collection, Miniature approx. 3 cm on edge, 4+ cm point to point, $125. Online September 15.
Translucent to transparent zoned bluish-purple and yellow octahedron with abundant inclusions of chalcopyrite and one isolated galena crystal as well as a few hydrocarbons. Polishing grade. Weight 47g.