The Noqui peralkaline granite covers some 9 km2, but extends over a much bigger area to the south in Angola (see Angola No. 1). It intrudes Zadinian mica schists and quartzites in the Matadi anticline which are feldspathised at the contact. The granite comprises abundant quartz, generally >30%, perthitic alkali feldspar, riebeckite, aegirine, a little biotite and magnetite and accessory orthite, calcite, parisite and zircon. Some facies may be syenitic. Petrographic, modal and chemical data will be found in Holmes (1915) and Mortelmans (1948).