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Eight reference samples from the U.S. Geological Survey have been analysed for their contents of F, Cl and water. After pyrolysis F was determined with an ion‐selective electrode, Cl by colorimetry and water by Karl‐Fischer titration.

Thirty‐three reference samples from the United States Geological Survey (USGS), Centre de Recherches Pétrographiques et Géochimiques (CRPG, France), Association Rationale de la Recherche Technique (ANRT, France), National Institute for Metallurgy (NIM, South Africa), Geotechnic Institute (GI, Austria), Mineralogical Institute of Basel and Bern (Switzerland), Zentrales Geolo‐gisahes Institut (ZG1, DDR) and from the For‐chungeinstitut der Zementinduatrie (Düsseldorf, GDF) were analysed for their fluorine and total water content. Fluorine was determined, after pyrohydrolysis, with an ion‐selective electrode. Total water was determined, after pyrolysis, by Karl‐Fischer titration. Our values, five determinations on each sample, are compared with the preferred values.

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