Located near Ngaoundéré (capital of Adamaoua Region).
Lacustrine late tertiary to quaternary sedimentary (sands and clays) basin in a depression of a basaltic plateau.
Black varved argilites that contains the big vivianite crystals are essentially composed of kaolinite, siderite, quartz, organic matter, fluorapatite, crandallite.
The sand lenses that contains the mantienneite are composed of quartz, feldpaths, volcanic glass, chromspinel, in a mantienneite, kaolinite, chlorite-montmorillonite mixed-layer and siderite cement.
Worldwide unique occurrence for the size of vivianite crystals abundant in black argillites (
http://www.musee.ensmp.fr/gm/60.html). [Link dead. Aug 2011]
References
- Fransolet, A.-M., Oustriere, P., Fontan, F. & Pillard, F. (1984): La mantiennéite, une nouvelle espèce minérale du gisement de vivianite d'Anloua, Cameroun. Bulletin de Minéralogie 107, 737-744
- Oustrière, P. (1984): Etude géologique et géochimique du bassin lacustre d'Anloua (Cameroun) : Application à la compréhension de la genèse de la vivianite, Doctorate Thesis, Orléans University, 1984
-Hanzel, D., Meisel, W. Hanzel, D. & Gütlich, P. (1990) : Conversion electron Mössbauer study of vacuum and thermally treated vivianite. Hyperfine Interactions 57: 2201-2208 [Vivianite from Anloua used in this study]
External Links
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http://giantcrystals.strahlen.org/africa/anloua.htmMineral List
16 entries listed. 14 valid minerals. 1 type locality (valid mineral).
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