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_ Treatment of the sample  _ Determination of total water  _ The sample blank for the main portion  _ Determination of moisture  _ Roasting the sample  _ Determination of silica in samples containing less than 2 percent fluorine  _ Determination of the R20 3 group  _ Removal of ammonium salts  _ Removal of manganese by ammonium persulfate Gravimetric determination of calcium oxide Gravimetric determination of magnesium  _ Recovery of calcium from the magnesium pyrophosphate precipitate  _ CONTENTS

A review of classical silicate-rock analysis and recommended modifications of classical methods of analysis