Chemical EDS map obtained with TEM on a feature composed of two nanophases observed in monazite hosted in quartz (M13). Analyzed area is shown on STEM-ADF image (left) and chemical map show the spatial distributions of Pb (blue) and Si (red). Pb is strictly localized in the bright area while the darker area contains Si. The mixing area is an effect of the superposition in depth of the two nanophases (FIB foil is 50 to 100 nm thick).