“Upper left: SEM image on a polished section of Florencite from Svodovyi area, Grubependity Lake, Russia, showing alternating zones of Florencite-(Sm), Florencite-(Nd), and Florencite-(Ce) (Zeiss Ultra, 30kV, SE2 detector, FOV of the SEM image ~460µm). Lower row: EDS maps of the most prominent REE present in the sample, Ce (left), Nd (middle), Sm(right). EDS-spectra taken for Florencite-(Ce) at the site marked in the respective element map are reproduced in the upper row for energy range 0.4keV - 8.0keV (middle) and in more detail between 3.0keV and 7.0keV (right) (Bruker Xflash 6, 30kV). The latter spectrum shows good agreement between measured and deconvoluted data assuming presence of La, Pr, Nd, Sm, and Gd in addition to dominant Ce. ”