AM_Hedenbergite_20 Formula: Ca Fe Si2 O6 Name: Hedenbergite Unit cell: 9.8357 9.0078 5.2408 90.0 104.664 90.0 , V=449.20 Space group: C12/C1 (15)

Redhammer G J , Amthauer G , Roth G , Tippelt G , Lottermoser W , American Mineralogist , 91 (2006) p.1271-1292, Single crystal X-ray diffraction and temperature dependent 57Fe Mossbauer, spectroscopy on the hedenbergite - aegirine (Ca,Na)(Fe2+,Fe3+)Si2O6 solid solution, Locality: synthetic, Sample: Hd21, T = 100K