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Septarian Nodule, this piece is about 8" in size. fossilized mud ball (concretion) from ancient seabeds, characterized by a grey, limestone-like exter...
Mineral, Crystals and rocks. including, Garnet, Prehnite, Chalcedony, Hematite, Pink Calcite, Chrysocolla, Sun Selenite, Flourite, Crocoite, Wulfanite...
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