Size: 12x9

Origin: Mined in Boron

Here we have for you a nice looking tumbled individual of a Sahara Desert NWA unclassified meteorite weighing 75

Clarity:   Nice crystal

Pseudomorph Goethite After Marcasite | Prophecy Stone | 27 gr | Farafra Oasis, Egypt | SO24 Mica Size: 12x9Pseudomorphs 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