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Analisi Chimica Al2O3 0,8-2,0% SiO2 72,0-73,0% Fe2O3 0,08-0,11% MgO 3,5-4,0% Na2O 13,3-14,3% K2O 0,2-0,6% CaO 7,2-9,2% SO3 0,2-0,3% Dati Tecnici Density: Ca. 2,6 g/cm3 Hardeness: Mohs 6 Grain Shape: ball-shaped Melting point ~ 730°C