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6 samples matching your criteria
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Sample n°3371 : rust-coloured black block (5 cm)Minerals: COLUMBITE TANTALITEYear: 1953Country: Rwanda
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Sample n°4441 : black plates (1 cm)Minerals: TANTALITEYear: 1954Country: Rwanda
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Sample n°12951 : black block with white crustMinerals: WOLFRAMITE KAOLINITEYear: 1972Country: Rwanda
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Sample n°10626 : fragmentsMinerals: COLUMBITEYear:Country: Rwanda
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Sample n°12493.50 : fragmentMinerals: TANTALITEYear: 1970Country: Rwanda
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Sample n°12493.49 : fragmentMinerals: TANTALITEYear: 1970Country: Rwanda