AM_Hydrochlorborite Formula: Ca2 B4 Cl O18 H21 Name: Hydrochlorborite Unit cell: 22.783 8.745 17.066 90.0 96.705 90.0 , V=3376.93 Space group: I12/A1 (15)

Brown G E , Clark J R , American Mineralogist , 63 (1978) p.814-823, Crystal structure of hydrochlorborite, Ca2[B3O3(OH)4.OB(OH)3]Cl.7H2O,, a seasonal evaporite mineral