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Help identifying this egg.

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Hello all, I am new to this forum, and I am trying to identify what type of mineral this beautiful egg is made out of. I appreciate any insight, Laura. 

5253AF78-00D6-4701-B791-40A234AA0C77.jpeg

25C93A27-6609-4F97-89C7-F623B9ABCDC2.jpeg

11C30CFD-41EE-4E4E-9192-92F7FE58C9AF.jpeg

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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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