AM_Pyroxene-ideal_109 Formula: Sc Na Si2 O6 Name: Pyroxene-ideal Unit cell: 9.929 9.189 5.305 90.0 109.8 90.0 , V=455.40 Space group: C12/C1 (15)

Thompson R M , Downs R T , American Mineralogist , 89 (2004) p.614-628, Model pyroxenes II: Structural variation as a function of tetrahedral rotation, model sodium scandium px after Ohashi et al. (1994A), with O3-O3-O3 angle = 173.7 and model oxygen radius = 1.328