Broker Research, page-181

"The use of a handheld p-XRF, while no substitute for whole-rock geochemical analysis, is standard industry practice and an effective and dynamic targeting tool used in LCT-pegmatite exploration. p-XRF data can be used to identify and assess granitic parent rock fertility with respect to the hosting potential of LCT pegmatites, and differentiate potential rare metal-bearing pegmatites from barren, more typical pegmatites with granitic composition.

Direct analysis of lithium is impossible using p-XRF due to X-ray physics limitations,however the latest generation of instruments can be used effectively to identify a key suite of whole rock and associated pathfinder elements1. This includes potassium (K), calcium (Ca), rubidium (Rb), strontium (Sr), yttrium (Y), niobium (Nb), tin (Sn), caesium (Cs), tantalum (Ta), antimony (Sb), tungsten (W), bismuth (Bi), arsenic (As), gallium (Ga), thallium (Tl), and the rare earth elements (REEs) of lanthanum (La) and cerium (Ce)."