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15 samples matching your criteria
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Sample n°3368 : groups of parallel black tabular pyramidal crystalsMinerals: CASSITERITEYear: 1953Country: Burundi
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Sample n°3369 : black aggregate (4 cm)Minerals: CASSITERITEYear: 1953Country: Burundi
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Sample n°3370 : yellow aggregate (cm) in white block (3 cm)Minerals: BISMUTHYear: 1953Country: Burundi
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Sample n°3371 : rust-coloured black block (5 cm)Minerals: COLUMBITE TANTALITEYear: 1953Country: Rwanda
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Sample n°18488 : massive oreMinerals: CHALCOPYRITE CHALCOCITE ENARGITE GALENA SPHALERITEYear: 2017Country: Namibia