AM_Gypsum Formula: Ca S O6 D4 Name: Gypsum Unit cell: 5.674 15.1049 6.4909 90.0 118.513 90.0 , V=488.83 Space group: I12/A1 (15)

Schofield P F , Knight K S , Stretton I C , American Mineralogist , 81 (1996) p.847-851, Thermal expansion of gypsum investigated by neutron powder diffraction, T = 4.2 K