Summary: Two methods using nujol and hexachloro-butadiene mulls are described to analyse the water content of powdered granite samples. The nujol mull analyses were carried out on a Unicam SP 100 spectrometer using the silica content of the rock as an internal standard. The hexachlorobutadiene mull analyses were done by a twin-path Unicam SP 200 spectrometer, using hexachlorobutadiene as the internal standard. The broader and more pronounced V1 vibrational mode (3450 cm−1) is ratioed to a standard of known composition. Comparisons are also made between absorption due to free water (V1 = 3450 cm−1) and combined water (V3 = 3680 cm−1) in aplites, biotite granite, and chlorite schists.