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  2 samples matching your criteria
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        Sample n°1368 : purple crystals on feldsparbearing rockMinerals: FLUORITE FELDSPARYear: 1936Country: Congo (RDC)
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        Sample n°1387 : black spots (5 mm) on yellow quartzMinerals: CASSITERITE QUARTZYear: 1936Country: Congo (RDC)