Gypsum and limonite minerals

Gypsum and limonite minerals

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Gypsum and limonite minerals. Limonite (orange) is a field name for various iron oxides and hydroxides. It is found in surface oxidation zones of iron deposits, or as a residue of carbonate and silicate breakdown in tropical conditions. Here, limonite is partially covering the thin crystals of gypsum (clear), a calcium sulphate mineral commonly found in sedimentary rock. Gypsum has a wide range of applications in industry, including for construction materials and food additives. This sample measures 50 x 70 millimetres.

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Keywords: calcium sulphate, crystal, crystalline, crystals, earth science, geological, geology, goethite, gypsum, hydroxide, hydroxides, iron oxide, limonite, mineral, mineralogy, minerals, oxides

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