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  3 samples matching your criteria
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        Sample n°271 : crystals on vein quartzMinerals: PYRITE QUARTZYear: 1911Country: Congo (RDC)
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        Sample n°273 : black, specularMinerals: HEMATITEYear: 1911Country: Congo (RDC)
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        Sample n°274 : tourmaline crystals (3 mm) in quarziteMinerals: TOURMALINE QUARTZYear: 1911Country: Congo (RDC)