Citation: Thompson, R. M.; Downs, R. T. (2004). Model pyroxenes II: Structural variation as a function of tetrahedral rotation model kosmochlor at 9.28 GPa after Origlieri et al. (2003) with O3-O3-O3 angle = 166.1 and model oxygen radius = 1.271. American Mineralogist, 89, pp. 614-628.