AM_Gaidonnayite
Formula: Na2 Zr Si3 O11 H4
Name: Gaidonnayite
Unit cell: 11.74 12.82 6.691 90.0 90.0 90.0 , V=1007.04
Space group: P21NB (33)

Chao G Y , The Canadian Mineralogist , 23 (1985) p.11-15, The crystal structure of gaidonnayite Na2ZrSi3O9.2H2O