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Seau urchin Rügen
Glauconite is a blue-green mineral, that belongs to the group of Micas. The mineral is commonly found in sediments. The occurrence of glauconite in sediments, is an indication of ancient anoxic environmental conditions. Glauconite can also be very useful in environmental reconstruction as well as radiometric dating of geological formations . Glauconite, has the chemical formula (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
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