Dimensions:  42x25x14 mm / 1

Typically occurs as yellow-greenish octahedral crystals

Oval and Pear Shape Cut

This is a superb looking slice of the Shişr or Shi 010 meteorite

Pseudomorph Goethite After Marcasite | Prophecy Stone | 45.2 gr | Farafra Oasis, Egypt Aventurine Dimensions: 42x25x14 mm / 1Pseudomorphs 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