Introduction -- Geological Settings of Archean Cratons -- Fieldwork and Sampling of Selected Pegmatites and Pegmatite Fields -- Petrography and Mineralogy -- Geochemistry -- Geochronology -- Stable and Radiogenic Isotopes. .Lithium-cesium-tantalum (LCT) pegmatites are important resources for rare metals. For Cs, only the LCT pegmatites with the zeolite group mineral pollucite at Bikita (Zimbabw…