Alkaline Rocks and Carbonatites of the World

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Karsa (Kersa)

stripes

Occurrence number: 
054-00-062
Country: 
Ethiopia
Location: 
Longitude: 39.87, Latitude: 5.45

Near Karsa two isolated outcrops of lava occur that consist of large sodic feldspar phenocrysts and rather fewer of aegirine in a matrix of alkali feldspar, aegirine, amphibole and nepheline.

References: 
LACROIX, A. 1930. Les roches hyperalcalines du massif du Fantalé et du Col de Balla (Abyssinie). Mémoires de la Société Géologique de France. Paris, Tome VI. 14: 89-102.MOHR, P.A. 1962a (reprinted 1971). The geology of Ethiopia. University College of Addis Ababa Press, Addis Ababa. 268 pp.
Location: 
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith