Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Chat Now! (2 online) Mindat Auctions

Anloua, Adamaoua Plateau (Adamawa Plateau), Adamaoua Region, Cameroon

StandardDetailedBy ChemistryMineral Photos (2)Search Google

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).

ref: http://giantcrystals.strahlen.org/africa/anloua.htm




Group 4 - Oxides and Hydroxides
  		• Anatase4.DD.05
    TiO
     
    2
    Group 8 - Phosphates, Arsenates and Vanadates
  		• Beraunite8.DC.27
    Fe
    2+
     
    		Fe
    3+
    5
    		[(OH)
     
    5
    		|(PO
     
    4
    		)
     
    4
    		] · 4H
     
    2
    		O
  		• Cacoxenite8.DC.40
    Fe
    3+
    24
    		Al[(OH)
     
    12
    		|O
     
    6
    		|(PO
     
    4
    		)
     
    17
    		] · 17H
     
    2
    		O
  		• Lipscombite8.BB.90
    (Fe
    2+
     
    		,Mn
    2+
     
    		)Fe
    3+
    2
    		[OH|PO
     
    4
    		]
     
    2
  		• Mantienneite (TL)8.DH.35
    KMg
     
    2
    		Al
     
    2
    		Ti[(OH)
     
    3
    		|(PO
     
    4
    		)
     
    4
    		] · 15H
     
    2
    		O
  		• Metavivianite8.CE.85
    Fe
    2+
    3-x
    		Fe
    3+
    x
    		(PO
     
    4
    		)
     
    2
    		(OH)x·(8-x)H
     
    2
    		O
  		• Phosphosiderite8.CD.05
    FePO
     
    4
    		·2H
     
    2
    		O
  		• Santabarbaraite8.CE.80
    Fe
    3+
    3
    		[(OH)
     
    3
    		|(PO
     
    4
    		)
     
    2
    		] · 5H
     
    2
    		O
  		• Strengite8.CD.10
    FePO
     
    4
    		·2H
     
    2
    		O
  		• Strunzite8.DC.25
    Mn
    2+
     
    		Fe
    3+
    2
    		[OH|PO
     
    4
    		]
     
    2
    		 · 6H
     
    2
    		O
  		• Vivianite8.CE.40
    Fe
    2+
    3
    		(PO
     
    4
    		)
     
    2
    		·8H
     
    2
    		O
    Unclassified Minerals
  		• Kertschenite-
    Fe
    2+
     
    		Fe
    3+
    2
    		[OH|PO
     
    4
    		]
     
    2
    		 · 6H
     
    2
    		O
  		• Oxiberaunite-
    (Fe
    3+
     
    		,Mn
    3+
     
    		)Fe
    3+
    5
    		[O|(OH)
     
    4
    		|(PO
     
    4
    		)
     
    4
    		] · 6H
     
    2
    		O


    13 entries listed. 11 valid minerals.

    The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database!
    This page is currently not sponsored. Click here to find out how you can sponsor this page.

    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 30th Nov 2009 04:16:06