1.

• A. $N{a}_{2}O. K_{2}O. C{e}_2{O}_2^{-} \times Si{O}_2$
• B. $N{a}_{2}O. K_{2}O. C{e}_2{O}_2^{-} \times Si{O}_2$
• C. $N{a}_{2}O. K_{2}O. C{e}_2{O}_2^{-} \times Si{O}_2$
• D. $N{a}_{2}O. K_{2}O. C{e}_2{O}_2^{-} \times Si{O}_2$

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