I picked up a couple of Super Nova chucks from John Keeton a few months back. I could have sworn that he had mentioned something about including memory however...caveat emptor...no memory included. In the spirit of gentlemanly sport, I'm sure that it is me who must have been mistaken.
I'm fairly new to this whole game. I had acquired some ziricote some time back and it included any and all 'off-fall' (the bark cut). It's also with the off-fall that you occasionally 'land' a burl. I recently had the idea to cut a few of them up into squares and give them a try as shallow bowl blanks. Thinner blanks end up with two opposing areas on the back rims that remain natural edge but the thicker pieces can be turned down enough where that is not an issue but either way, they look pretty good. Ziricote in general and the 'bark cut' in particular is prone to cracking so you need to either work around (read: leave them) or epoxy them, depending upon their location and / or magnitude.
This wood is similar to the cocobolo in that it is very hard, heavy, and dense so the finish is micro mesh sanded and paste wax only. The photos show: Keeton's chucks (the ones without the memory), a pallet of the off-fall, with one surfaced piece on top, the 'bowl' still in the chuck after waxing, and then a few of the finished piece. One of the finished shots includes a couple of the blanks as well.
Side note: For the life-of-me, I can't figure out how to upload photos and get them to view in the rotation that I upload them. I'm sure there's a simple solution but one which continues to elude me. It is the mysteries that keep life interesting.