A 50-mg sample is fused with a flux mixture of 2.5 g of Na2CO3 and 0.5 g of ZnO, followed by digestion with distilled water on a hotplate. The fluoride is removed from the melt, taken up in water and transferred to a distillation flask, by steam distillation, and determined by the zirconium eriochrome cyanine R method. Recovery of F from minerals such as hornblende and apatite was within ± 1 to 3 percent of the total F present or added as standard NaF.

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