CLAYS + FELDSPARS + ALUMINIUM SILICATE MINERALS (MINING)
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BTINORGANIC ECONOMIC MINERALS AND EARTHS (MINING)
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UDC622.361
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Descriptor GERTONE + FELDSPATE + ALUMINIUMSILIKATMINERALE (BERGBAU)
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Descriptor ENGCLAYS + FELDSPARS + ALUMINIUM SILICATE MINERALS (MINING)
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Descriptor FREARGILES + FELDSPATHS + SILICATES D'ALUMINIUM (INDUSTRIE MINIÈRE)
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NTFELDSPAR (MINING)