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White Desert, farafra, Egypt
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Hematite pseudomorph after marcasite, White Desert, Farafra, Egypt. Collected by us in the 1990s. This is a pseudomorph; the shape of this nodule, which is 3.5 cm in diameter, is a crystallisation of marcasite, an iron sulphide, which has been replaced over millions of years by hematite, an iron oxide.