CHRYSOBERYL (MINERALOGY)
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BTALUMINATES, ANHYDROUS AND BORATES (MINERALOGY)
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UDC549.731.2
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Descriptor GERCHRYSOBERYLL (MINERALOGIE)
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Descriptor ENGCHRYSOBERYL (MINERALOGY)
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Descriptor FRECHRYSOBERYL (MINÉRALOGIE)
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NTALEXANDRITE (MINERALOGY)