Alkaline Rocks and Carbonatites of the World

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Bollo

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Occurrence number: 
029-00-012
Country: 
Cameroon
Location: 
Longitude: 12.92, Latitude: 8.27

Mount Bollo is built of biotite-amphibole gneisses within which are masses, up to 200 m long, of equigranular gneiss containing quartz, microcline, albite, riebeckite and a little aegirine; there is also a brown amphibole referred to by Koch (1955b and 1959b) as barkevikite.

References: 
KOCH, P. 1955b. Sur un gneiss à riebeckite du Nord-Cameroun. Compte Rendu Sommaire des Séances de la Société Géologique de France, 274-5.KOCH, P. 1959b. Le Précambrien de la frontière occidentale du Cameroun central. Bulletin de la Direction des Mines et de la Geologie, Territoire du Cameroun. Paris, 3: 1-301.
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