Rainbow rocks, rainbow gneiss? Rocks of Love? I was excited to find this rock it a ...

in DBuzzlast year

... lmost looked painted!! Apparently there is huge boulders of rocks like this in MN somewhere. Will look for them and post when I find it! Minnesota rocks



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It looks pretty. 💎 ...I guess it naturally looks like that? I wonder why?

Anyway what does MN stand for?

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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/

https://www.geocaching.com/geocache/GC4DDNK_rainbow-gneiss

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It hardly seems this way however I believe this is a banded iron formation (BIF). Layers of Iron solidifying at different temps different times under different elements... creates this rainbow effect.

I think. Not a rock doctor.