Pseudomorph Goethite After Marcasite | Prophecy Stone | 72 gr | Farafra Oasis, Egypt | SO24 Topaz Name: Holmquistite

Name:  Holmquistite

These pieces are a good example of the shrapnel type Sikhote-Alin

This aspect appeals to those who prefer gemstones with known origins and minimal environmental impact

impactites are directly linked to them and their impacts and are probably going to be one of the rarest collection pieces you'll ever own

Pseudomorph Goethite After Marcasite | Prophecy Stone | 72 gr | Farafra Oasis, Egypt | SO24 Topaz Name: HolmquistitePseudomorphs 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