Size: 16x7

Color: Bright Yellow

Heulandite is one of the most common and well known members of the Zeolite Group

Color:  Black with Yellow 6 Rays Star

Note the dividing disc with an excellent shock vein network

Pseudomorph Goethite After Marcasite | Prophecy Stone | 45.8 gr | Farafra Oasis, Egypt Moldavite Size: 16x7Pseudomorphs 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