AM_Protopyroxene_4 Formula: (Mg1.54 Sc.23) Li.23 Si2 O6 Name: Protopyroxene Unit cell: 9.0877 8.7526 5.1531 90.0 90.0 90.0 , V=409.88 Space group: P21CN (33)

Yang H , Finger L W , Conrad P G , Prewitt C T , Hazen R M , American Mineralogist , 84 (1999) p.245-256, A new pyroxene structure at high pressure: Single-crystal X-ray and Raman study