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Over a billion years ago
These pieces are a good example of the shrapnel type Sikhote-Alin
The most common color of sunstone is a warm and vibrant orange or reddish-brown
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
Name: Stilbite on Heulandite Cluster
Pseudomorph Goethite After Marcasite | Prophecy Stone | 72 gr | Farafra Oasis, Egypt | SO24 Topaz Over a billion years agoPseudomorphs 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
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