AM_Phase-X_1 Formula: K1.54 Mg1.92 Si2 O7 Name: Phase-X Unit cell: 5.0812 5.0812 13.2112 90.0 90.0 120.0 , V=295.40 Space group: P63CM (185)

Yang H , Konzett J , Prewitt C T , American Mineralogist , 86 (2001) p.1483-1488, Crystal structure of phase X, a high pressure alkali-rich hydrous silicate, and its anhydrous equivalent, Sample: JKW56