Alkaline Rocks and Carbonatites of the World

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Gamedou

stripes

Occurrence number: 
121-00-022
Country: 
Niger
Location: 
Longitude: 11.5, Latitude: 13.58

This occurrence consists of peralkaline microgranite and rhyolite but no description of the geology has been traced. The microgranite contains phenocrysts of quartz, alkali feldspar and sodic amphibole together with aegirine/aegirine-augite, fayalite and aenigmatite. The rhyolite is much altered but spongy quartz, titanite and hematite are recognisable; spherulites are present.

References: 
GARDE, G. 1911. Description géologique des regions situées entre le Niger et le Tchad et a l'est et au nord-est du Tchad. These, Université de Clermont-Ferrand. Published by A. Hermann et Fils, Paris. 284 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