Primary deposits occur in acidic granitic magmas and pegmatites. It occurs in nepheline syenite intrusives and in nepheline syenite pegmatites. Wolframite is found in quartz veins and pegmatites associated with granitic intrusives. Alkaline magmas enriched with rare-earth elements include carbonatites, peralkaline granites (pegmatites), and nepheline syenite. Large crystals of mica used for various applications are typically mined from granitic pegmatites. Cordierite also occurs in some granites, pegmatites, and norites in gabbroic magmas. It is particularly common in granitic pegmatites. This is separated from a biotite muscovite granite by pegmatites. Large crystals of quartz are found in magmatic pegmatites. Beryllium becomes concentrated in felsic pegmatites in which chromium is almost absent. Some skarns associated with granites also tend to host pegmatites. Pyrochlore occurs in pegmatites associated with nepheline syenites and other alkalic rocks. It also occurs in pegmatites and in contact metamorphic zones. It occurs as an oxidation product of uranium minerals in granite pegmatites and hydrothermal deposits. It forms by high grade metamorphism of high silica quartz rich rocks and in pegmatites.