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3 samples matching your criteria
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Sample n°75 : cut fragments (?)Minerals: QUARTZYear: 1899Country: Congo (RDC)
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Sample n°136 : botryoidal aggregates on ferruginous substrateMinerals: MALACHITEYear: 1900Country: Congo (RDC)
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Sample n°137 : prisms, pyramidal terminationsMinerals: QUARTZYear: 1900Country: Congo (RDC)