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3 samples matching your criteria
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Sample n°241 : desintegrated aggregate of black crystalsMinerals: VIVIANITEYear: 1904Country: Congo (RDC)
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Sample n°242 : concretions with the shape of tubes and branchesMinerals: GOETHITEYear: 1905Country: Congo (RDC)
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Sample n°7068 : powderMinerals: VIVIANITEYear: 1959Country: Congo (RDC)