Thanks, all.
Ed, the piece of wood is a slice I took off an aspen root burl so I could mount it on my lathe. With root balls and Australian burls, I try to cut thin slices to get it down to where I can mount it, then I use the slices in other woodworking projects (you know that woodturners never throw ANY scraps out!).
Mike, I think my favorite is the black marble. The photo doesn't really show the chantoyance in the blank.
Have a good day!