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This fascinating specimen formed when gemmy calcite crystals grew in the natural pocket formed by a buried fossil clamshell. The interior of the shell is now completely covered with these fine, golden crystals. This is a LARGE and very complete example, with two "windows" so you can see into the crystal-filled interior from either side! One of the best we have seen of these... 13.0 x 10.6 x 5.0 cm
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