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LD3-FKRCalcite CaCO3 , Chalcopyrite CuFeS2
Oker valley, Harz, Goslar District, Lower Saxony, GermanyDimensions: 80 mm x 50 mm x 60 mm
Largest Crystal Size: 5 mm
Weight: 265 g
Calcite on Chalcopyrite
Mass: 265
Locality: quarry Sudmerberg II near Oker and Goslar, Germany - there are 3 quarries where one can find mostly fossils.
Also ref. to: https://www.mineralienatlas.de/lexikon/index.php/Deutschland/Niedersachsen/Goslar%2C%20Landkreis/Goslar/Oker/Steinbr%C3%BCche%20am%20Sudmerberg