  Pyritized Ammonite.
See the previous two samples for more information about this type of fossil. This is not, I repeat not, an artificially enhanced sample! It's not plated or painted or metalized, just cut and polished to bring out the natural shine of the pyrite crystal.
Source: Exclusive Fossils/Nord Fossil
Contributor: Theodore Gray
Acquired: 29 March, 2003
Price: $25
Size: 1.5"
Composition: FeS2
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