The Layered Gabbro Series at Seiland, Northern Norway. By Tom. F. W. Barth With 4 text-figures. Seiland...Seiland is a large island on the northern coast of Norway, covering about 600 km2 . It lies within the zone...muscovite, zircon. 5. Quartz-diorite pegmatites: Oligoclase, quartz, musco vite, garnet, tourmaline. 6. Diorite...Diorite pegmatites (= plumasites) : Oligoclase, musco vite,': biotite, magnetite, apatite, zircon, corundum...inhomogeneous canadite pegmatite striking westward from Bekkarfjordnes for many kilometers and attaining a width of |