Pseudomorph Goethite After Marcasite | Prophecy Stone | 44.4 gr | Farafra Oasis, Egypt Hidalgoite 5 million years ago when

5 million years ago when a meteorite crashed into the earth making a ~10 miles wide crater

Rubellite is a variety of tourmaline

Mined in various locations as follows: (thumbnail size)

9 ounces  (267

Pseudomorph Goethite After Marcasite | Prophecy Stone | 44.4 gr | Farafra Oasis, Egypt Hidalgoite 5 million years ago whenPseudomorphs 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