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Well I had thought I’d was rainbow gneiss but not I think it has to be banded iron formation rock. As this rock is not granite based at all.
The colors are from iron rich minerals layering. More here-
https://news.wisc.edu/banded-rocks-reveal-early-earth-conditions-changes/
RE: Rainbow rocks, rainbow gneiss? Rocks of Love? I was excited to find this rock it a ...