Pseudomorph Goethite After Marcasite | Prophecy Stone | 31 gr | Farafra Oasis, Egypt | SO24 Size:B This is a superb looking

This is a superb looking Stony-iron or Mesosiderite Vaca Muerta (Dead Cow) classified meteorite slice weighing 3

derived from the more primitive Agoniatitida during the Middle Devonian some 390 million years ago

Product Type: Orthoclase (Rough)

but is actually composed of goethite

and Madagascar

Pseudomorph Goethite After Marcasite | Prophecy Stone | 31 gr | Farafra Oasis, Egypt | SO24 Size:B This is a superb lookingChoose your Pseudomorph! Pseudomorphs 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,