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24 samples matching your criteria
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Sample n°142 : pink block, prominent cleavageMinerals: MICROCLINEYear: 1900Country: Congo (RDC)
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Sample n°143 : grey cleaved crystalsMinerals: MICROCLINE BIOTITEYear: 1900Country: Congo (RDC)
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Sample n°6029 : group of prismatic pyramidal crystals (30 cm)Minerals: QUARTZYear:Country: Tanzania
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Sample n°108 : quartz with malachite spots and iron oxidesMinerals: HEMATITE MALACHITEYear: 1900Country: Congo (RDC)