AM_Protopyroxene_2 Formula: (Mg1.54 Sc.23) Li.23 Si2 O6 Name: Protopyroxene Unit cell: 9.2178 8.7039 5.3119 90.0 90.0 90.0 , V=426.18 Space group: PBCN (60)

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