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  4 samples matching your criteria
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        Sample n°6401.1 : yellow coating on vein quartzMinerals: NONTRONITEYear: 1958Country: Congo (RDC)
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        Sample n°6422 : mixed clay blocksMinerals: NONTRONITE MONTMORILLONITEYear:Country: Congo (RDC)
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        Sample n°6823 : grass-green clayey block (8 cm)Minerals: NONTRONITEYear: 1954Country: France
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        Sample n°15722 : nontronite with slickensidesMinerals: NONTRONITEYear: 1966Country: South Africa