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141 samples matching your criteria
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Sample n°554 : stalactitic concretionMinerals: CHALCEDONY (quartz)Year: 1910Country: Congo (RDC)
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Sample n°555 : blocks with pink and green veins, var chrysopraseMinerals: QUARTZYear: 1913Country: Congo (RDC)
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Sample n°556 : geode with prismatic crystals (1 cm)Minerals: QUARTZ CHALCEDONY (quartz)Year: 1913Country: Congo (RDC)
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Sample n°557 : zoned pink blockMinerals: CHALCEDONY (quartz) QUARTZYear:Country: Congo (RDC)
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Sample n°716 : chisel-shaped crystals (2 cm) in chalcedony geodeMinerals: CALCITE CHALCEDONY (quartz) QUARTZYear: 1912Country: Congo (RDC)
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Sample n°717 : elongated white crystals, silkyMinerals: SILLIMANITEYear: 1909Country: Congo (RDC)
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Sample n°718.1 : fragment (10 cm)Minerals: SILLIMANITEYear: 1909Country: Congo (RDC)
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Sample n°718.2 : rounded black crystal, var. fibroliteMinerals: SILLIMANITEYear: 1909Country: Congo (RDC)
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Sample n°719 : mesh of crystals on rounded fragmentMinerals: KYANITEYear:Country: Congo (RDC)
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Sample n°720 : rock with large black crystalsMinerals: KYANITE QUARTZYear:Country: Congo (RDC)