Alkaline Rocks and Carbonatites of the World

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Lunda

stripes

Occurrence number: 
005-00-005
Country: 
Angola
Location: 
Longitude: 21.05, Latitude: -8.12

Exposures of nepheline syenite covering 700x100 m occurring along the Chiumbe River, and intruding basement gneisses, are described by Correia (1966). The rock is leucocratic and consists of 50% albite (Ab96), 45% nepheline, which is partly altered to cancrinite, rare microcline and accessory magnetite, titanite, biotite, calcite, apatite, perovskite and zircon. An analysis includes 11.84% Na2O and 2.59% K2O.

References: 
CORREIA, E.A. 1966. Uma variedade curiosa de sienito nefelínico da Lunda (Angola). Boletim. Serviços de Geologia e Minas Angola. Luanda. 14: 91-6.
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