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  3 samples matching your criteria
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        Sample n°1343 : band of black fibres in pegmatiteMinerals: TOURMALINEYear: 1938Country: Congo (RDC)
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        Sample n°1347 : plate-shaped crystals (6 cm)Minerals: MUSCOVITEYear: 1939Country: Congo (RDC)
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        Sample n°1352 : crust of dark prismatic crystals (2 cm)Minerals: QUARTZYear: 1939Country: Congo (RDC)