On another board, a poster made a rather cryptic remark about a mineral substance identified as tremolite that is used as a substitute for asbestos in modern construction. Perhaps a component of rock wool incorporated into the insulation? Would it have contributed to any of the oddities in the dust?
(Lets see if Jones eventually tries to tell us that that should be present in thermite.)
And now, thinking of that, was there any significant amount of calcium in any of Jones' microspheres? That should have been present in any kind of cast thermite that i can think of, which would be neccessary to make some of the cuts that would support Jones' theories.