Not really doing any. I purchased the motors and put together a frame etc to make a sphere machine based off an old friends sphere machine that they used to produce before they passed away. Never got around to putting it together. I have had the bug to lately, but I have so many other projects it is on back burner. I did hand cut 2 small spheres by hand - roughing them out and then using pipe caps by hand with grit to finish them. By hand of course I chose soft materials and did a cave onyx and howlite. The ones I did 20 years ago were:
Icicle Agate, Blue Forest Wood, Flowering Onyx, Palm Root, Nipomo Marcasite, Nipomo Sagenite, Sierra Pelona Onyx, Silver Sheen Obsidian are the ones I remember and the 2 shown here, most were 2 to 2.5.
I do have an area with large chunks of Ilmenite that is very unusal material when cut. The Dark and chrome looking areas remind me of the Widman / Statman lines of Meteorites. On top of that it has high gold content. I had some assayed and I'll have to find the assay report but It was either .4 or 4 ounces per ton. Of course being in Iron the recovery would be a nightmare. I made some cabs out of it and think it would make a cool sphere. I found out about the Gold because I had a guy in our shop take a torch to it to see what happened when it melted I was thinking forging but had no idea about forging. Anyway he took and blasted a huge cavity in the Iron and in the bottom pooled the gold which I first blew off as Pyrite and then remembered that Pyrite doesn't melt and had a different piece assayed.