>Aluminium (I am a european) is very common in most soils, So I think
>e got a lot of it. It is a question in what form it comes, not
>wether it comes at all, because it does.
>Besides Oog did not live in a cave. He lived in a hut.
>Caves preserves archeologic material, so that is where the founds are
>made, but caves are pretty rare.


There is a world of difference between elements presents in soils and their
presence in plants . Plants don't suck out every minerals present in soil
they have an instinctive diet too they choose what enter their system. Like
it was pointing out in an other post , in a humus rich soil  ( before
deforestation) , aluminium is bound to fulvic acid . The problem arise when
the mineral is present in a Free form "avid "to be part of a new  organic
compound. Disturbing the fragile microcospic ecosystem of the top soil
 mechanicaly or chemically) ,  do that ,liberating elements creating salty
soil. Thoses free "soluble " become poison for the plants and they loose
their ability to choose correctly their diet the same way that denaturing
food do that to animals or humans.
But still the aluminium present in excess in plants tissues  might represent
no more than a small proportion of all other sources of " industrial"
aluminium or dissolved in water.
jean-claude