Calcite and oxides inside a glendonite masse
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Calcite and oxides inside a glendonite masse

by Sophie Graul, Tallinn University of Technology, Tallinn, Estonia and France

Details of calcite, goethite, hematite and pyrite crystallisation in a micro-geode formed in a glendonite. Glendonites are found in Lower Ordovician (485,4- 477,7 Ma) black shale formations in Estonia.