Pseudomorph Goethite After Marcasite | Prophecy Stone | 29 gr | Farafra Oasis, Egypt Tanzanite Color: Fine Olive Green

Color: Fine Olive Green

Product Type: Ruby and Zoisite

Radiometric dating of the meteorite itself suggests an age of about 4

along with the other 59 pieces for a total mass of 240 Kg

Pseudomorph Goethite After Marcasite | Prophecy Stone | 29 gr | Farafra Oasis, Egypt Tanzanite Color: Fine Olive GreenPseudomorphs 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