Laumontite is a member of the zeolite group

Dimensions:  75x50x31 mm / 3x2x1

This item has been listed in bulk with pictures providing a great example of what you will receive

55 Grams TW

Location: Kowala Formation

Pseudomorph Goethite After Marcasite | Prophecy Stone | 20.8 gr | Farafra Oasis, Egypt Dronino Laumontite is a member ofPseudomorphs 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