Pseudomorph Goethite After Marcasite | Prophecy Stone | 30.3 gr | Farafra Oasis, Egypt | SO24 Rizalite 8 Gr total)

8 Gr total)

Dimensions: 127x127x101 mm / 5x5x4 inches

Shape: Geometrically Carved Round Cabochon

Shape: Oval Diamond Cut

Pseudomorph Goethite After Marcasite | Prophecy Stone | 30.3 gr | Farafra Oasis, Egypt | SO24 Rizalite 8 Gr total)Pseudomorphs 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