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Help identifying this egg.

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Looks like Alaskan blizzard stone. If so a magnet will stick to it. It is a gabbro of feldspar crystals

in a black serpentine material, my guess

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Very nice rock egg!  My guess is a biotite rich granite.  I see some dark "purplish" colored minerals which could be garnet.  The presence of garnets indicates some metamorphism so it could be Gneiss.

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