Pseudomorph Goethite After Marcasite | Prophecy Stone | 45.8 gr | Farafra Oasis, Egypt Herkimer Tektite can still be interesting

Tektite can still be interesting just because of the persistent mystery that resisted clear explanations of their creation for generations of geologists

Those don't take away from how interesting this piece is

Dimensions:  62x57x41 mm / 2

This spectacular blue green specimen will be a start in your collection

Pseudomorph Goethite After Marcasite | Prophecy Stone | 45.8 gr | Farafra Oasis, Egypt Herkimer Tektite can still be interestingPseudomorphs are mineral specimens that have the external shape of one mineral but are composed of another. The pseudomorph goethite after marcasite forms when marcasite is exposed to oxidizing conditions and starts to oxidize and break down. As the marcasite breaks down, goethite replaces it in the crystal structure, preserving the shape of the original marcasite crystal. The resulting specimen appears as a marcasite crystal, but is actually composed