AM_Luneburgite Formula: Mg3 P2 B2 O20 H18 Name: Luneburgite Unit cell: 6.3475 9.8027 6.2976 84.46 106.4 96.4 , V=372.70 Space group: P-1 (2)

Sen Gupta P K , Swihart G H , Dimitrijevic R , Hossain M B , American Mineralogist , 76 (1991) p.1400-1407, The crystal structure of luneburgite, Mg3(H2O)6[B2(OH)6(PO4)2]