Pseudomorph Goethite After Marcasite | Prophecy Stone | 27 gr | Farafra Oasis, Egypt | SO24 NWA 2949 This rare specimen is in

This rare specimen is in very good condition and is a spectacular combination of minerals

It is commonly found in association with other minerals such as limonite

Then this Stony-iron or Mesosiderite Vaca Muerta (Dead Cow) classified meteorite was found in 1861 in the driest desert of the world called the Atacama

Name: Aegirine on Microcline crystal

Pseudomorph Goethite After Marcasite | Prophecy Stone | 27 gr | Farafra Oasis, Egypt | SO24 NWA 2949 This rare specimen is inPseudomorphs 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