AM_Whitlockite Formula: (Mg.587 Fe.413) Ca9.095 P7 O28 Name: Whitlockite Unit cell: 10.33 10.33 37.103 90.0 90.0 120.0 , V=3428.79 Space group: R3C (161)

Calvo C , Gopal R , American Mineralogist , 60 (1975) p.120-133, The crystal structure of whitlockite from the Palermo quarry