AM_Phase-B-superhydrous
Formula: Si3 Mg10 O18 H4
Name: Phase-B-superhydrous
Unit cell: 5.0894 13.968 8.6956 90.0 90.0 90.0 , V=618.16
Space group: PNNM (58)

Pacalo R E G , Parise J B , American Mineralogist , 77 (1992) p.681-684, Crystal structure of superhydrous B, a hydrous magnesium silicate synthesized at, 1400 C and 20 GPa