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16<br />

Constituent<br />

Si0 2<br />

TiO2<br />

A12O3<br />

Cr 2°3<br />

FeO*<br />

MnO<br />

MgO<br />

CaO<br />

Total<br />

Si<br />

Ti<br />

Al<br />

Cr<br />

Fe<br />

Mn<br />

Mg<br />

Ca<br />

1 2<br />

(12-3)(10-10)<br />

39.2<br />

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