We have already talked about and shown other examples of the strange habit of fluorite 'corners" from Elmwood, in this extensive midwest specialty update. Here is a very unusual specimen because it actually illustrates HOW these things form. As you look at it in the video, you can see that the fluorite started as a large cubic crystal from a previous era of deposition, forming out of hot fluids in the original pocket. Later, hot fluids rich with fluorite came back into the pocket, but sucked away molecules from the cube, showing preferential tendency to attack the centers and faces, while corners were left intact by default (this has something to do with the different bonding strength of fluorite molecules on corners vs edges and faces). Usually, these fall apart into corners. Rarely, we get a double or a cluster. However, here, we see a remnant and clearly cubic fluorite caught in the middle of a process of dissolution, where we see much more of the crystal preserved from one angle (exterior) even as we can turn it over and see both incipient corner stalks within; and simultaneously witness the chaotic process of dissolution in the sponge like fluorite mass between the corners. The more you look, the more fascinating and detailed the specimen is. Baryte crystals atop are a nice welcome accent, as a bonus. It is really a statement and discussion piece, to hold and turn over in your hands, that helps illustrate how the classic Elmwood style fluorite stalks have formed. It is also rather large for such an example, and in excellent condition. Petroleum inclusions give strong fluorescence, with other needle-like inclusions visible in fluorescence as well. Walt Gaylord, to Arkenstone, and then to Scott Kleine #08 in his collection of Elmwood corners. Walt was a local competitor to the great Steve Neely for collecting Elmwood minerals; as he was the mine geologist throughout several projects in the 1980s-90s. He sold us his choice collection in the early 2000s, from which we sold this to Kleine and it has not otherwise been on the market in decades.