Our club has a tub of Barnesite (like 50 lbs.) that I know I'm never going to use up in this lifetime, as I have been using some from an opened tub, and also use Universal #363 Cerium. We might divvy it up into usable portions and put it in the classifieds.
I happen to like Barnesite, ever since it came with my 6" Edmund kit in 1966..I've read that it is as slow as rouge and all other kinds of opinions. In my hands at least, I find it as fast as Cerium, and it cleans up very quickly. I know that it's not produced because the refining techniques don't comply with the rules....No, it's not radioactive.
It's a vanadium oxide, the raw form is a beautiful red crystal, and I believe the polishing compound is a mixture with other rare earth oxides.
If anyone is interested in using this, let me know and I will furnish details re: particle size, purity and other data I can find.