A 72% SiO2, 22% Na2O and 6% CaO
B 72% SiO2, 22% Na2O and 6% Hg
C 70% SiO2, 24% Fe(OH)3 and 6% Fe2O3
D 72% SiO2, 20% Na2O and 8% CaO
Correct Answer: Option A
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