Pseudomorph Goethite After Marcasite | Prophecy Stone | 37.6 gr | Farafra Oasis, Egypt Elpidite Otter Lake area

Otter Lake area

These ultra rare crystals are from the Polaris Mine

Origin: Russia

There is one large white scapolite crystal on the back wall which is 2" long

This is a good looking Gibeon classified meteorite etched cube weighing 12

Pseudomorph Goethite After Marcasite | Prophecy Stone | 37.6 gr | Farafra Oasis, Egypt Elpidite Otter Lake areaPseudomorphs 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