Sphalerite (Iridescent) with Chalcopyrite and Gypsum, Tri-State District, Oklahoma, Dr. David London Collection L-122, Small Cabinet 3.5 x 6.0 x 8.0 cm, $450. Online Sept. 30.
Highly iridescent sphalerite with epitaxic chalcopyrite and bladed selenite. Spectacular iridescence, if I was collecting Tri-State minerals this would never leave the house. A great small cabinet specimen. Choice and undamaged. Ex. Alan Graffam collection.