Pseudomorph Goethite After Marcasite | Prophecy Stone | 51.7 gr | Farafra Oasis, Egypt | SO24 H6 This is an outstanding Monturaqui

This is an outstanding Monturaqui Impactite specimen weighing 5

Typical clast deformation looks looking like a loaf cut into slices but not fully broken into pieces

Weight: 129

73 Grams / 8 Lbs 3 Ounces

Pseudomorph Goethite After Marcasite | Prophecy Stone | 51.7 gr | Farafra Oasis, Egypt | SO24 H6 This is an outstanding MonturaquiPseudomorphs 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