AM_Hilgardite-1A_1 Formula: Ca2 B5 O10 Cl H2 Name: Hilgardite-1A Unit cell: 6.463 6.564 6.302 61.63 118.77 105.78 , V=205.88 Space group: P1 (1)

Rumanova I M , Iorysh Z I , Belov N V , Soviet Physics Doklady , 22 (1977) p.460-462, Crystal structure of triclinic chilgardite Ca2[B5O9]Cl*H2O =, Ca2[B3+-B2deltaO9]Cl*H2O