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Production is a blend of both materials Al2O3 2.8% SiO2 5.1% P2O5 22.8% SO3 0.7% K 0.3% Ca 0.6% Cr 0.2% Mn 8.4% Fe 23.0% Cu 0.1% Zn 0.2% and Al2O3 2.0 % SiO2 5.2 % P2O5 33.0 % K 0.5 % Ca 1.3 % Mn 10.9 % Fe 17.8 % Cu 0.1 % Nb 0.4 % Bi 0.1