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[–] oedipusaurus_rex 0 points 4 points (+4|-0) ago 

It's been changing. Gneiss is the most heavily metamorphosed rock. It's been buried deep enough and heated enough that it started flowing as a solid.

I'm jealous of OP. Gneiss is one of my favorite rocks, and I've been wanting a piece of the Acasta for a while now.