Crystal Cluster I dug in Pennsylvania

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Calcite Fossilized Clam I dug in Florida

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300 million-year-old Carboniferous Ferns: Saint Clair, Pennsylvania

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Huge Pyrite Cube Cluster from Spain

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Megalodon Tooth found in a SC Creek

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Herkimer Diamond Quartz Crystal I Found on my Property.

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Can someone explain this and what it is? Broke it open it was empty, looks like pyrite cube was in there but dissolved? Found in PA coal mine

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