Al2O3\mathrm{Al}_{2} \mathrm{O}_{3}Al2O3
SiO2\mathrm{SiO}_{2}SiO2
Li2O\mathrm{Li}_{2} \mathrm{O}Li2O
B2O3\mathrm{B}_{2} \mathrm{O}_{3}B2O3