stripes
This oval-shaped 4x3 km intrusion is enveloped in laterites overlying Precambrian basement rocks. The main rock type is a coarse nepheline syenite consisting of perthite, abundant nepheline (as much as 30%), in some varieties blue sodalite, a greenish clinopyroxene, which may be rimmed by amphibole, occasional biotite and accessories including zircon and titanite. Around the intrusion small rubbly outcrops of sanidine trachyte may derive from dykes. The rock contains a little quartz, amphibole, which may form phenocrysts, acicular aegirine and monazite.
CIVETTA, L., DE VIVO, B., GIUNTA, G., IPPOLITO, F., LIMA, A., ORSI, G., PERRONE, V. and ZUPPETTA, A. 1980. Geological and structural outlines of the southern Sudan. Atti Convegni Lincei Academia Nazionale dei Lincei, 47: 175-83.HUNTING GEOLOGY AND GEOPHYSICS LIMITED, 1980. Mineral exploration of the Juba area. Unpublished Report, Democratic Republic of Sudan, Southern Regional Government, Regional Ministry of Finance, Industry and Economic Planning. 56 pp.