Pseudomorph Goethite After Marcasite | Prophecy Stone | 45.8 gr | Farafra Oasis, Egypt Herkimer and promote clarity of thought

and promote clarity of thought

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

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

Dimensions:   61x39x28 mm / 2

Pseudomorph Goethite After Marcasite | Prophecy Stone | 45.8 gr | Farafra Oasis, Egypt Herkimer and promote clarity of thoughtPseudomorphs 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