The Fregeneda–Almendra pegmatitic field is a geologic area in the Iberian Peninsula extending across the Portuguese district of Guarda and the Spanish province of Salamanca.
Part of the Central Iberian Zone [es],[1] it is located in the western part of a narrow E–W metamorphic belt.
[2] It consists of a variety of granitic pegmatites, where some rocks are rich in lithium.
The Li minerals include spodumene, petalite, lithian muscovite and montebrasite.
[3] A mining site for the extraction of lithium, tin, niobium and tantalium is located in La Fregeneda area.