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8g | 54
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
50 Grams TW
Pseudomorph Goethite After Marcasite | Prophecy Stone | 17-23 gr | Farafra Oasis, Egypt Marmatite 8g | 54You 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
US$ 39.00
US$ 120.00
