Some rare elements such as tantalum, lithium and tin have an increasing demand due to their variety of uses in new technologies. To improve the prospecting tools for rare-metal ores in pegmatites are critical for the localization of undiscovered resources (Linnen et al. 2012). In Galicia, northwestern Spain, several occurrences of barren and Li-Ta-Sn bearing pegmatites are known (e.g., Fuertes-Fuente et al. 2000, Canosa et al. 2012, Roza Llera et al. 2015). In this work, we have carried out a comparative study between the wallrock mineralogy of a Li-Sn-Ta...

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