Prehistoric Fossil Mud #1 Rare Crystals_Opal Deep purple in colour with

Deep purple in colour with smoky and white colour banding

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Prehistoric Fossil Mud #1 Rare Crystals_Opal Deep purple in colour withFound in the North African desert, this is an example of ironstone regolith concretion formed by the hardening of iron rich mud in layers over huge periods of time in sedimentary sandstone. Although the technical term would be ironstone concretion, it's much easier to explain as fossilised mud, due to how they were created, with each piece having a totally unique form and pattern. You'll receive the exact piece of 'fossil mud' as pictured.