The celestite problem in gypsum Sr geochemistry: An evaluation of purifying methods of gypsiferous samples

In conclusion, the presence of celestite must always be taken into account when gypsiferous samples are analyzed for their Sr content, or their 87Sr / 86Sr ratio, in order to avoid seriously biased results and non-reliable geochemical and paleoenvironmental interpretations. In celestite-rich samples it is convenient to separate the celestite before carrying out the analysis.