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Shungura formation, Lower Omo Valley, Lake Rudolf (Lake Turkana), Sidamo-Borana Province, Ethiopia

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Ref.: American Mineralogist (1979): 64: 169-171.

Pliocene/Pleistocene lacustrine sediments.
G22, G24 and G25 submembers of the Shungura Formation.
Phosphates are associated with fossil fish scales and bones.





Mineral List:
  		•  Apatite-(CaOH)
    Ca
     
    5
    		[OH|(PO
     
    4
    		)
     
    3
    		]
    Description: Micro-hexagonal prisms coprecipitated with mitridatite-robertsite.
    Reference: [American Mineralogist, Vol. 64, 1979, pp. 169-171.]
  		•  Apatite-(CaOH)
    var: Carbonate-rich Apatite-(CaOH)
    Ca
     
    5
    		[(OH,O)|(PO
     
    4
    		,CO
     
    3
    		)
     
    3
    		]
    Description: Fossil remains constituent.
    Reference: [American Mineralogist, Vol. 64, 1979, pp. 169-171.]
  		•  Calcite
    CaCO
     
    3
    Description: Calcite nodules in alkaline lacustrine sedimentation levels.
    Reference: [American Mineralogist, Vol. 64, 1979, pp. 169-171.]
  		•  Gypsum
    Ca[SO
     
    4
    		] · 2H
     
    2
    		O
    Description: In saline lacustrine sedimentation levels.
    Reference: [American Mineralogist, Vol. 64, 1979, pp. 169-171.]
  		•  Halite
    NaCl
    Description: In saline lacustrine sedimentation levels.
    Reference: [American Mineralogist, Vol. 64, 1979, pp. 169-171.]
  		•  Limonite
    FeO(OH)·nH
     
    2
    		O
    Reference: [American Mineralogist, Vol. 64, 1979, pp. 169-171.]
  		•  Mitridatite
    Ca
     
    2
    		Fe
    3+
    3
    		[O
     
    2
    		|(PO
     
    4
    		)
     
    3
    		] · 3H
     
    2
    		O
    Description: Feathery olive-green microcrystals.
    Reference: [American Mineralogist, Vol. 64, 1979, pp. 169-171.]
  		•  Quartz
    SiO
     
    2
    Reference: [American Mineralogist, Vol. 64, 1979, pp. 169-171.]
  		•  Robertsite
    Ca
     
    3
    		Mn
    3+
    4
    		[(OH)
     
    3
    		|(PO
     
    4
    		)
     
    2
    		]
     
    2
    		 · 3H
     
    2
    		O
    Description: Mitridatite-robertsite series.
    Reference: [American Mineralogist, Vol. 64, 1979, pp. 169-171.]
  		•  'Smectite Group'
    A
     
    0.3
    		D
     
    2-3
    		[T
     
    4
    		O
     
    10
    		]Z
     
    2
    		·nH
     
    2
    		O
    Reference: [American Mineralogist, Vol. 64, 1979, pp. 169-171.]


    10 entries listed. 7 valid minerals.

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