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The tests revealed a rare chemical reaction, with aluminous tobermorite crystals growing out of another mineral called phillipsite.

Previous work had revealed lime particles within the cores that surprisingly contained the mineral aluminous tobermorite – a rare substance that is hard to make.

Pertaining to or containing alum, or alumina; as, aluminous minerals, aluminous solution.

It is now applied to the dark-coloured aluminous members of the monoclinic amphiboles, occupying in this group the same position that augite occupies in the pyroxene group.

At the bottom of the kiln a vaulted fireplace is made of the same kind of rock; the remainder of the empty part of the kiln is then entirely filled with the same aluminous rocks.