stripes
Occurrence number:
005-00-015
Country:
Angola
Location:
Longitude: 15.02, Latitude: -12.32
Carbonatite:
No
Nepheline syenite has been described from Monte Elonga and consists of 75% alkali feldspar, 11% nepheline, 8% brown hornblende, a little biotite and accessories including augite and aegirine. Rocks described as nepheline monzonite form dykes of which two analyses are available.
References:
ANDRADE, M. de 1954. Contribution à l'étude des roches alcalines d'Angola (note preliminaire). 19th International Geological Congress, Algiers. Comptes Rendus, 19: 241-52.
Location: