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.
