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Infrared emission spectroscopy has been used to study the phase transformations of gypsum, thenardite, glauberite, and anhydrite between the temperatures of SO and 1400°C. It is shown that emission spectroscopy can be used to monitor these changes in situ and that metastable forms and reversible transformations are easily detected.
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Vassallo et al. (1992) studied this question.
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