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These do not alter the outstanding dispersion
Size: 12x10mm
Size: 9x6mm
Specimen Size: Cabinet-Sized
Pseudomorph Goethite After Marcasite | Prophecy Stone | 30 gr | Farafra Oasis, Egypt | SO24 Rhodochrosite These do not alter thePseudomorphs 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
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