Pseudomorph Goethite After Marcasite | Prophecy Stone | 44.4 gr | Farafra Oasis, Egypt Hidalgoite 59 Grams / 9

59 Grams / 9

The stones define an elliptical strewn-field measuring 7x3

Its dimensions are  39x35x10 mm

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

9 ounces  (267

Pseudomorph Goethite After Marcasite | Prophecy Stone | 44.4 gr | Farafra Oasis, Egypt Hidalgoite 59 Grams / 9Pseudomorphs 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