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Analisi Chimica Al2O3 65,28% Fe2O3 22,80% SiO2 6,07% CaO 0,80% MgO 0,01% Na2O 0,37% K2O 0,12% TiO2 3,07% MnO 0,02% Loss on ignition 1,39% Hardeness: (mohs) 9-9,5 SIZE Available: from 14 to 300