AM_Pyroxene-ideal_116 Formula: Mn Ca Si2 O6 Name: Pyroxene-ideal Unit cell: 9.94 9.248 5.339 90.0 108.3 90.0 , V=465.97 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 johannsenite after Freed and Peacor (1967), with O3-O3-O3 angle = 163.8 and model oxygen radius = 1.348