AM_Pyroxene-ideal_113 Formula: Ni Ca Si2 O6 Name: Pyroxene-ideal Unit cell: 9.724 9.043 5.221 90.0 108.5 90.0 , V=435.38 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 calcium nickel px after Ghose et al. (1987), with O3-O3-O3 angle = 165.2 and model oxygen radius = 1.316