Hi Jinx
I researched those crystal deodorant stones some more (which I massively slagged off in the above thread some time ago<img src="/ubbthreads/images/graemlins/mad.gif" alt="" />) and turns out they are in fact safe to use. They have been recommended by Andreas Moritz and he explained that the aluminium salts in the crystal are not the poisonous aluminium of regular deodorants, they are safe natural things and cannot hurt or harm you.

I now use a crystal deodorant stone when I need to use a deodorant.