exploration techniques, supported by examples from central Europe and Africa. Geological exploration commonly...Variscides [7–12], the Sveconorwegian orogeny [13,14], Central-East Africa [15–18] and Australasia [19–22]. These...mineralogy and geochemistry of quartz, garnet, topaz, columbite-group minerals, (3) pegmatite structure (zonation...graphic quartz-feldspar intergrowths) beryl and columbite-group minerals, (3) pegmatite structure (zonation...15–20 m is currently (in 2018) exploited for columbite-tantalite mineralisation. kaolinisation of of |