AM_Pigeonite_55 Formula: Mg1.85 Ca.15 Si2 O6 Name: Pigeonite Unit cell: 9.651 8.846 5.252 90.0 108.38 90.0 , V=425.50 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: Dien2, Note: c-cell parameter changed by personal communication with author, Dec 2003