AM_Tincalconite_1 Formula: Na2 B4 O11.667 H8.667 Name: Tincalconite Unit cell: 11.1402 11.1402 21.207 90.0 90.0 120.0 , V=2279.27 Space group: R32 (155)

Luck R L , Wang G , American Mineralogist , 87 (2002) p.350-354, On the nature of tincalconite