AM_Laumontite Formula: Si4 Al2 O15.126 Ca H14 Name: Laumontite Unit cell: 14.70542 13.07118 7.45156 90.0 112.121 90.0 , V=1326.89 Space group: C12/M1 (12)

Fridriksson T , Bish D L , Bird D K , American Mineralogist , 88 (2003) p.277-287, Hydrogen-bonded water in laumontite I: X-ray powder diffraction, study of water site occupancy and structural changes in laumontite, during room-temperature isothermal hydration/dehydration, Sample: P = 0.11 mbar PH2O