Ferropericlase (Mg,Fe)O (fPer) is the most common mineral of the
juvenile ultramafic association. It forms small (b1 mm) grains of an
octahedral, cubic, or cubic-octahedral habit which can be single inclusions
in diamond or form intergrowths with MgSi-perovskite, CaSiperovskite,
stishovite (SiO2), TAPP, phase with the composition of olivine,
chrome spinel, ilmenite, and native nickel. Ferropericlase grains
comprise, in some areas, up to 50–56% of all identified lower-mantle
inclusions.