Large geode??

[tattooedmomma]

About 8" wide. This rock looks different than most. Its really heavy

 

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[Jim in Idaho]

Could be a geode...or maybe a solid nodule. If it's either you should be able to see light through it. Nice find. I've never seen a nodule that big, though I have found 4 or 5 incher here in Idaho.
Jim