Pseudomorph Goethite After Marcasite | Prophecy Stone | 76.2 gr | Farafra Oasis, Egypt Abee 39 gram slice of Black

39 gram slice of Black Onaping Impact Fallback Breccia from the famous Sudbury Impact Structure in Ontario Canada

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Size: 34x21mm

Here we have for you a nice looking individual fragment of a Sahara Desert NWA unclassified meteorite weighing 52

Pseudomorph Goethite After Marcasite | Prophecy Stone | 76.2 gr | Farafra Oasis, Egypt Abee 39 gram slice of BlackPseudomorphs 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