AM_Hungchaoite Formula: Mg B4 O16 H18 Name: Hungchaoite Unit cell: 8.807 10.657 7.897 103.39 108.53 97.18 , V=667.62 Space group: P-1 (2)

Wan C , Ghose S , American Mineralogist , 62 (1977) p.1135-1143, Hungchaoite, Mg(H2O)5B4O5(OH)4.2H2O: a hydrogen-bonded molecular complex