Ahh it’s all how these LCT pegmatites are formed. Very basically...

Ahh it’s all how these LCT pegmatites are formed. Very basically ,big crystallising granites expel lots of super hot water containing the minerals.
They looking for a place to go and the surrounding rock is it.( only LCT pegs not NYF or others).
Here they’re Neoarchean in age 2.7 billion years old.
And amphibole ( volcanics like basalts) are older so already there.
They follow faults or folds in the rocks and emplace really quickly.
Of course it has to be particular granites ( S) rich in Li , with particular mix of minerals to help the pegmatite water to flow( eg Fl) , with right hosting sites , emplaced in a shallow zone etc etc.