Grey limestone and iron oxide

Grey limestone and iron oxide

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This image is part of the sequence environment: Geoscope geological park and samples


Caption: Grey limestone and iron oxide, close-up. This calcarerous sedimentary rock has an oolithic texture that is not easily visible. The grey colour comes from very fine iron sulphide (pyrite) crystals, produced in a reducing environment. Iron oxidation by oxygen-rich water may change the colour to reddish-orange, as seen here down centre. This specimen is part of the Geoscope geological park, located between Les Monts-Vert and Albaret-Sainte-Marie, central France.

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Keywords: aire de la lozere, calcarerous, calcite, calcium carbonate, close-up, detail, earth science, europe, european, exhibit, france, french, geochemistry, geological, geological park, geology, geoscope, grey limestone, iron oxide, iron sulphide, la lozere, mineral, mineralogy, oolithic, oxidation, physical geography, pyrite, rock, rust, rusty, sample, sedimentary, specimen

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