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Some of the oldest zircon crystals have been dated to be over 4 billion years old
This is a rare and fantastic 7
prismatic crystals nestled in vugs on contrasting limonite matrix
An impact so big it cracked the earth
This L6 classified meteorite was sighted in the early morning hours of March 31
Pseudomorph Goethite After Marcasite | Prophecy Stone | 30.2 gr | Farafra Oasis, Egypt | SO24 Vanadinite Some of the oldest zirconPseudomorphs 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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