AM_Hulsite Formula: Sn.2 Fe2.63 Mg1.12 B2 O10 Name: Hulsite Unit cell: 10.695 3.102 5.432 90.0 94.2 90.0 , V=179.73 Space group: P12/M1 (10)

Konnert J A , Appleman D E , Clark J R , Finger L W , Kato T , Miura Y , American Mineralogist , 61 (1976) p.116-122, Crystal structure and cation distribution of hulsite, a tin-iron borate