AM_Pigeonite_54 Formula: Mg.911 Fe.854 Al.033 Mn.027 Ti.01 Na.003 Ca.192 Si1.97 O6 Name: Pigeonite Unit cell: 9.716 8.948 5.25 90.0 108.49 90.0 , V=432.87 Space group: P121/C1 (14)

Merli M , Camara F , European Journal of Mineralogy , 15 (2003) p.903-911, Topological analysis of the electron density of the clinopyroxene, structure by the maximum entropy method: an exploratory study, Sample: BTS-308 n.13, Note: Site occupancies are from personal communication with Camara, Dec 2003