Pseudomorph Goethite After Marcasite | Prophecy Stone | 29 gr | Farafra Oasis, Egypt Tanzanite forming elongated crystals with distinct

forming elongated crystals with distinct cleavage angles

others include amber and pearl

Product Type: Labradorite

Dimensions:  66x49x37mm / 2

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 forming elongated crystals with distinctPseudomorphs 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