Pseudomorph Goethite After Marcasite | Prophecy Stone | 37.6 gr | Farafra Oasis, Egypt Apatite 8 gram Impact Vesicular Breccia

8 gram Impact Vesicular Breccia also referred to as Suevite coming from the famous Rochechouart impact structure in Southwestern France

typically ranges in color from light blue to pale blue

This impact breccia was found near the villages of Belchite and Fuendetodos near the center area of this large multiple impact structure

Weight:  161 Grams / 5

Pseudomorph Goethite After Marcasite | Prophecy Stone | 37.6 gr | Farafra Oasis, Egypt Apatite 8 gram Impact Vesicular BrecciaPseudomorphs 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