As always, you provide us with really significant information.

What is the apparent or relative hardness of this material? I mean, is it hard enough that it makes a clinking sound when banged or banged together, and does it therefore seem "stone-like"?

Is it possible that this stuff is what the "magnesite" and/or "reconstructed magnesite" beads might be made from? Or, would you say (or guess) that the magnesite beads are from a different industry?

I am still distracted by ideas that a lot of this material has been reconstructed. That could just be a mistaken interpretation for what are actually just plastic materials—such as you show here.

THANKS! Jamey