AM_Periclase_96 Formula: (Mg.99 Fe.01) O Name: Periclase Unit cell: 4.212 4.212 4.212 90.0 90.0 90.0 , V=74.72 Space group: FM-3M (225)

Boiocchi M , Caucia F , Merli M , Prella D , Ungaretti L , European Journal of Mineralogy , 13 (2001) p.871-881, Crystal-chemical reasons for the immiscibility of periclase and wustite, under lithospheric P,T conditions, Sample: after heating to 1100 deg C