Pseudomorph Goethite After Marcasite | Prophecy Stone | 45.2 gr | Farafra Oasis, Egypt Tatahouine which makes recovery of small

which makes recovery of small meteorite fragments hard

Color:  Multicolor

It commonly occurs alongside Aegirine

but aragonite which forms within caves

Weight: 204 grams - 7

Pseudomorph Goethite After Marcasite | Prophecy Stone | 45.2 gr | Farafra Oasis, Egypt Tatahouine which makes recovery of smallPseudomorphs 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