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Ships within 48 hours · Estimated delivery Aug 23 - Aug 28
Reserve from the case
Ships within 48 hours · Estimated delivery Aug 23 - Aug 28
Treatment: None - Unheated
Product ID: SS0280
Size: 18mm
often with unique banding
Size: 28x11mm
Pseudomorph Goethite After Marcasite | Prophecy Stone | 42gr | Farafra Oasis, Egypt NWA 2126 Treatment: None - UnheatedPseudomorphs 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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