Yup, and you can find them all if you look close.
But I know you want to do the volume calculations, Steph.
Come on, how big are the mibs it's made from?
Double ingots, found in Illinois together long ago, with matching marbles I've found since.
This sextuplet was in the same group and measures a near perfectly round 1 1/8" (w/o the nub ) - it's Bill's now.
Super collection, Alan, thanks for sharing. The pic is great too. I may have to keep it on my desktop for a while so I can absorb it all - it's really great!