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by saba2008 1694 days ago
>there’s no natural way for it form on Earth.

'Naturally forming' elements on Earth are limited to uranium fission products.

Lithium (also aluminium, magnesium, sodium) distribution is due to it being light and chemically active, thus ending up in crust, while heavier metals (iron, nickel) end up in mantle and core. It takes specific geological circumstances to bring mantle material into crust, so there are 'hot spots'. Lithium is already there, so it is spread somewhat evenly.