Pseudomorph Goethite After Marcasite | Prophecy Stone | 17-23 gr | Farafra Oasis, Egypt Marmatite The similar deformations are well

The similar deformations are well known from the Ries crater impact ejecta that occurred in carbonate concretions and in the famous Ries Belemnites both embedded within soft Jurassic claystone

reddish orange (rose) and even black

variable degree of weathering dependent on the specimen size and most likely paired also with the NWA 2932 and 2945

metallic luster and gray color led scientists to mistakenly believe it was a lead mineral

Pseudomorph Goethite After Marcasite | Prophecy Stone | 17-23 gr | Farafra Oasis, Egypt Marmatite The similar deformations are wellYou will receive one of the Pseudomorphs pictured. 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