AM_Phase-D Formula: Mg1.11 Si1.89 H2.22 O6 Name: Phase-D Unit cell: 4.7453 4.7453 4.345 90.0 90.0 120.0 , V=84.73 Space group: P-31M (162)

Yang H , Prewitt C T , Frost D J , American Mineralogist , 82 (1997) p.651-654, Crystal structure of the dense hydrous magnesium silicate, phase D