boric acid mixture. These results show that the silica content of a calcium fluoride-quartz mixture can be determined very accurately. Tests were made on mixtures containing 0.5 gram of calcium fluoride and from 0.01 to 0.1 gram of quartz. The method is no doubt applicable to samples containing larger amounts of quartz. The results are listed in Table I. Table I-Determination of Silica in Fluorspar-Quartz Mixture
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