In the West Asturian-Leonese Zone there are some albititic beds of volcanoclastic origin interlayered in the lower part of the Serie de los Cabos, deposited in a graben-type basin during the Middle Cambrian. The mineralogy is plagioclase (albite), rutile, sheet silicates and sometimes quartz, carbonates and chlorite-serpentine cryptocrystalline masses.
Melting experiments at 850ºC, 6 kbar and added 10% water conditions produce very silicic melts, with different rates of melting according to quartz percentage, but the fertility of these rocks as sources of leucogranites is very low.
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