Alkaline Rocks and Carbonatites of the World

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Occurrence number: 
005-00-019
Country: 
Angola
Location: 
Longitude: 18.3, Latitude: -12.7

This occurrence, information on the form of which has not been found, consists of a nepheline syenite containing what is described as primary calcite (Sousa, 1921). The rock comprises alkali feldspar, forming vermicular intergrowths, nepheline, apatite, biotite, muscovite, magnetite and green spinel (Sousa, 1920). A rock analysis is given by Sousa (1921).

References: 
SOUSA, M.P. de 1920. Contribution a l'étude lithologique de l'intérieur de l'Angola. Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences, Paris, 170: 238-40.SOUSA, M.P. de 1921. Sur quelques roches remarquables de l'Angola. Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences, Paris, 173: 777-80.
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