The coordination state of sulfur in the silicate mineral scapolite has been a subject of discussion in recent years (Lovering and White, 1964; Schwarcz and Speelman, 1965). In this paper, the coordination of sulfur is determined by comparing the wavelengths of sulfur Kα radiation produced by fluorescent excitation of calcium sulfide, calcium sulfite and calcium sulfate (gypsum), with the wavelengths of the fluorescent radiation emitted by two samples of sulfur-rich scapolite, one from Laacher See in Germany and the other from Delegate, Australia.

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