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236 samples matching your criteria
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Sample n°11888 : sample with golden-yellow elongated mundite crystals, felty fine-acicular yellow upalite, ranunculite as bright golden-yellow small crystals and as crust of yellow-orange crystals, fluorescent white meta-autunite crusts, metamict zirconMinerals: MUNDITE UPALITE COLUMBITE META-AUTUNITE RANUNCULITE URANINITE ZIRCONYear: 1969Country: Congo (RDC)
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Sample n°12054 : massive coarse-grained intergrowths, one polished surfaceMinerals: CASSITERITE COLUMBITE TANTALITEYear: 1969Country: Portugal
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Sample n°12133 : black plates (1 cm)Minerals: COLUMBITEYear:Country: Rwanda
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Sample n°12134 : dark grey plates (2 cm)Minerals: COLUMBITEYear:Country: Rwanda
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Sample n°12345 : bright black plates (2-4 cm)Minerals: COLUMBITEYear: 1970Country: Rwanda
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Sample n°12493 : crystals, fragments, matrix occurrenceMinerals: COLUMBITE TANTALITE-(Mn) MICROLITE WODGINITEYear: 1970Country: Rwanda
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Sample n°12654 : brown plates (1 cm) and green platelets in pegmatiteMinerals: COLUMBITE MUSCOVITEYear: 1971Country: Congo (RDC)
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Sample n°12656 : broken tabular crystals (4 cm) in vein quartzMinerals: COLUMBITE QUARTZYear: 1971Country: Congo (RDC)
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Sample n°12657 : small crystals in vein quartzMinerals: COLUMBITE QUARTZYear: 1971Country: Congo (RDC)
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Sample n°12683 : black concentrate (5 mm)Minerals: COLUMBITEYear: 1971Country: Congo (RDC)