The Edough crystalline complex is built up of different eruptive and metamorphic rocks, from which some metabasaltic rocks, pyroxenites, plagioclasites and pegmatites are very interesting from the point of view of tungsten mineralization. They are located in gneisses and mica schists of Precambrian to Paleozoic age. Tungsten mineralization is concentrated mostly in the pyroxenites and metabasaltic rocks, and therefore the origin and geochemistry of these rocks has been studied. All rocks under discussion were metamorphosed under amphibolite facies conditions and consequently they were recrystallized under greenschist facies conditions. Available analytical results from pyroxenites and metabasites show elevated contents of tungsten in the mentioned rock clans.