molybdenite forms in high-temperature environments such as in igneous rocks

Color: Intense Fine blue

Dimensions:  66x49x37mm / 2

It is a large specimen and is in excellent condition

Shape: Baguette Cut

Pseudomorph Goethite After Marcasite | Prophecy Stone | 38 gr | Farafra Oasis, Egypt Calcite molybdenite forms in high-temperature environmentsPseudomorphs 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