Citation: Yang, H.; Finger, L. W.; Conrad, P. G.; Prewitt, C. T.; Hazen, R. M. (1999). A new pyroxene structure at high pressure: Single-crystal X-ray and Raman study of the Pbcn - P2_1cn phase transition in protopyroxene Sample at P = 2.03 GPa, (Mg1.54Li.23Sc.23)Si2O6. American Mineralogist, 84, pp. 245-256.