Some people use that for dating the Earth as being 4.6 billions of years old...
(media.conspiracies.win)
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Aluminium 26, for example.
What do you mean by "naturally occuring metal"? It's not about metal, it's about element. And aluminium is very common element on earth, in form of clay and many other minerals. All that minerals include aluminium that have isotope that decaying and created constantly by cosmic radiation if exposed to it. Half-life of aluminium-26 is 700 000 years.
What are you talking about? Aluminium is most prevalent element on Earth among metals. You literally walking on it and even now it surrounding you in huge amounts in concrete or bricks if you are not in wooden house.