Alkaline Rocks and Carbonatites of the World

Setup during HiTech AlkCarb: an online database of alkaline rock and carbonatite occurrences

Calucala

stripes

Occurrence number: 
005-00-002
Country: 
Angola
Location: 
Longitude: 14.17, Latitude: -9.08
Carbonatite: 
No

A mesocratic nepheline syenite, referred to as etindite, is briefly described by Andrade (1959) and consists of 34% nepheline, 48% augite, 45% olivine, as phenocrysts and microphenocrysts, and 14% biotite plus magnetite. It would thus appear to be an ijolite. No other details have been traced.

References: 
ANDRADE, M.M. de 1959. Analise quimicas de rochas eruptivas de Angola, publicadas áte fins de 1959. Publicações do Museu e Laboratorio Mineralógico e Geológico da Faculdade de Ciências do Porto, (4 Serie) 76: 1-77.
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