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What is the rarest mineral in the world?

User Dkubb
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Painite is the world's rarest mineral of all listed on Earth.There has only be been 2 crystals known unto scientist that were found on Earth's surface.This particular mineral is made of aluminium, calcium, boron, zirconium and oxygen.
User Pax
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I believe that would be Painite. 
User NeilInglis
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