  Pyritized Ammonite.
This ammonite was tagged as a Quenstediceras sp. from the Jurassic age (161 million years old), Callovain Stage, Ulyanovsk, Russia. The matrix of rock it's attached to shows very nice pyrite crystals. See the sample information above for more about this type of fossil.
Source: Time Trips
Contributor: Theodore Gray
Acquired: 29 March, 2003
Price: $12.95
Size: 1.5"
Composition: FeS2
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