Composite chemical maps of thick sections of (a) Bajoca petalite-rich pegmatite, (b) Ramalha petalite-rich pegmatite (P016) and (c) Li-mica-rich pegmatite (P010). Note the partial replacement of K-feldspar and cassiterite phenocrysts by albite (a,b) as well as albite-quartz-columbite-group mineral (CGM) vein crosscutting K-feldspar (b). CGM tend to be spatially associated to amblygonite-group minerals in (a-b) and apatite occurs as alteration product around AGM (a) and Fe-Mn phosphates (b).