The Na/Cl, Na/Br and Cl/Br ratios in some fluorites (sample weight 20-30 mg) have been studied by non-destructive activation analysis. Some experiments are described which show that the analyses refer to the liquid inclusions.One specimen studied in detail showed a Na/Cl ratio corresponding to a NaCl solution. Its Cl/Br weight ratio of 63 contrasts to the ratios of sea water as well as most surface and subsurface waters, but is similar to some brines. Some possible explanations are mentioned. The method seems useful in the study of liquid inclusions, especially since it can be used for several other elements and other minerals.

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