(2pc) PAIR POLISHED SEPTARIAN GEODE NODULES

拍品描述

These two septarian nodules (also known as Dragon's Eggs or Lightning Stones) feature polished faces that expose an internal cavity of yellow calcite crystals. The crystalline centers are bordered by patterns of dark brown aragonite and grey limestone. Each specimen retains its natural rough tan exterior on the reverse side. The flat bases are finished with green felt. h. 6 x w. 5.5 x d. 3 in. (ea., approx.) n.b. Septarian nodules began forming 50 to 70 million years ago on ancient ocean floors during the Cretaceous period. Inventory Code: 1X-33

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