Cathodoluminescence (a, f, i) and BSE images (e, g), as well as EDS (b) and WDS (c-d, h) chemical maps of cassiterite from FA Li-pegmatites. (a-e) Cassiterite crystal from the petalite-rich Bajoca pegmatite showing a Nb-Fe-rich core with low CL signal brecciated by high-CL, Nb-Fe-poor, cassiterite. The low-CL cassiterite is inclusion-free whereas the high-CL cassiterite hosts inclusions of columbite-group minerals (CGM), muscovite, albite, quartz and amblygonite-group minerals (AGM). (f-h) Low-CL, Nb-Mn-rich, cassiterite brecciated by high-CL, Nb-Mn-poor, cassiterite hosting CGM, mica and albite inclusions from the Li-mica-rich Feli pegmatite. (i) Cassiterite breccia from the Feli pegmatite consisting of low- and high-CL cassiterite (black to yellow), albite (blue) and mica (red).