Large Cleaved Yellow Fluorite Octahedron with Chalcopyrite from Cave-in-Rock, Illinois, USA

This is a very fine example of the yellow fluorite “diamonds” with glittering chalcopyrite inclusions from the last century. The piece has been cleaved from a larger piece of fluorite by a miner into the octahedron shape. These fluorite “diamonds” became very hard to get today since the mines in the southern Illinois have been closed in the mid-1990s. Miners back then used to cleave these “diamonds” during their lunch breaks.