AM_Anhydrite Formula: Ca S O4 Name: Anhydrite Unit cell: 6.993 6.995 6.245 90.0 90.0 90.0 , V=305.48 Space group: AMMA (63)

Hawthorne F C , Ferguson R B , The Canadian Mineralogist , 13 (1975) p.289-292, Anhydrous sulphates. II. Refinement of the crystal structure of anhydrite