AM_Aluminium Borate Formula: B1.04 Al4.8 Cr.16 O9 Name: Aluminium Borate Unit cell: 7.71 15.07 5.7 90.0 90.0 90.0 , V=662.28 Space group: A21AM (36)

Garsche M , Tillmanns E , Almen H , Schneider H , Kupcik V , European Journal of Mineralogy , 3 (1991) p.793-808, Incorporation of chromium into aluminium borate, 9Al2O3*2B2O3 (A9B2), Sample: Single crystal structure refinement of AgB2+Cr