Pseudomorph Goethite After Marcasite | Prophecy Stone | 20.8 gr | Farafra Oasis, Egypt Aegirine This rare specimen would be

This rare specimen would be an amazing addition to any new or existing collection

Dimensions:  114x93x60 mm / 4

It is relatively durable

Product ID: SPPP97502

The fusion crust of a meteorite can weather over time

Pseudomorph Goethite After Marcasite | Prophecy Stone | 20.8 gr | Farafra Oasis, Egypt Aegirine This rare specimen would bePseudomorphs 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