Pseudomorph Goethite After Marcasite | Prophecy Stone | 38 gr | Farafra Oasis, Egypt Ring 0 gr / 21x21x9 mm

0 gr / 21x21x9 mm

Product Name: Tourmaline with Albite Crystal

Additionally

This is a quality specimen and would be a beautiful addition to any new or existing rock collection

ungrouped)

Pseudomorph Goethite After Marcasite | Prophecy Stone | 38 gr | Farafra Oasis, Egypt Ring 0 gr / 21x21x9 mmPseudomorphs 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