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3 samples matching your criteria
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Sample n°6819 : granular black mass on gangue materialMinerals: BRAUNITE PYROLUSITE BARYTEYear: 1954Country: Germany
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Sample n°6880 : plates on block of iron ore (5 cm), var. thuringiteMinerals: CHAMOSITEYear: 1954Country: Germany
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Sample n°14016 : black plate (5 cm)Minerals: COVELLITEYear: 1983Country: Germany