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Origin: Arizona
not only for its engineering marvel but also for the extremely unusual selenite specimens that were discovered during excavations
Origin: Mined in Bihar/Orissa
it is a high quality specimen that would make an amazing addition to any new or existing collection
Pseudomorph Goethite After Marcasite | Prophecy Stone | 17 gr | Farafra Oasis, Egypt Molybdenite Origin: ArizonaPseudomorphs 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
