SiO3 . Al O3 . Cr , O. FeO . MnO CaO . MgO . NaO . KO . HO and HFl . Total . I. 47.88 8.23 0.50 II . 47-40 7.35 III . 43-23 11-72 -- 16.15 trace 7.05 18.40 ...
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