AM_Boltwoodite
Formula: U K Si O7 H2
Name: Boltwoodite
Unit cell: 7.073 7.064 6.638 90.0 105.75 90.0 , V=319.21
Space group: P1211 (4)

Stohl F V , Smith D K , American Mineralogist , 66 (1981) p.610-625, The crystal chemistry of the uranyl silicate minerals