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Nkumbwa Hill Carbonatite (Nkombwa Hill Carbonatite), Isoka, Isoka District, Muchinga Mts., Northern Province, Zambia

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Carbonatite plug, consisting of fairly homogeneous white, medium- to fine-grained ankeritic dolomite carbonatite (rauhaugite) which is cut by sills and dykes, 1 to 2 m wide, of medium- to coarse-grained ferrocarbonatite. The west-central part of the plug is intensely silicified. The Nkombwa Hill carbonatite is deficient in calcium, as evidenced by the absence of calcite carbonatite, but has high magnesium and fluorine contents, reflected in the abundance of dolomite and phlogopite, and the presence of fluorite, apatite, sellaite, and isokite.

Located about 15 miles east of Isoka.

Ref.:
- Zambezi, P., Voncken, J.H.L., Hale, M., and Touret, J.L.R. (1997): Bastnäsite-(Ce) at the Nkombwa Hill carbonatite complex, Isoka District, northeast Zambia. Mineralogy and Petrology 59, 239-250.





 Map Reference: 10°10'S , 32°51'E

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Mineral List:
  		•  Apatite-(SrOH)
    (Sr,Ca)
     
    5
    		(PO
     
    4
    		)
     
    3
    		(OH,F)
    Reference: []
  		•  Baryte
    BaSO
     
    4
    Reference: [Zambezi, P., Voncken, J.H.L., Hale, M., and Touret, J.L.R. (1997): Mineralogy and Petrology 59, 239-250.]
  		•  Bastnäsite-(Ce)
    (Ce,La)[F|CO
     
    3
    		]
    Reference: [Zambezi, P., Voncken, J.H.L., Hale, M., and Touret, J.L.R. (1997): Mineralogy and Petrology 59, 239-250.]
  		•  Daqingshanite-(Ce)
    (Sr,Ca,Ba)
     
    2
    		(Ce,La)PO
     
    4
    		(CO
     
    3
    		,OH,F)
     
    3
    Reference: [MinMag 58:493]
    Site Photo
    Nkumbwa Hill Carbonatite (Nkombwa Hill Carbonatite), Isoka, Isoka District, Muchinga Mts., Northern Province, Zambia
    © Pavel M. Kartashov
  		•  Dolomite
    CaMg(CO
     
    3
    		)
     
    2
    Reference: [Zambezi, P., Voncken, J.H.L., Hale, M., and Touret, J.L.R. (1997): Mineralogy and Petrology 59, 239-250.]
  		•  Fluorite
    CaF
     
    2
    Reference: [Zambezi, P., Voncken, J.H.L., Hale, M., and Touret, J.L.R. (1997): Mineralogy and Petrology 59, 239-250.]
  		•  Ilmenite
    Fe
    2+
     
    		TiO
     
    3
    Reference: []
  		•  Isokite (TL)
    CaMg[F|PO
     
    4
    		]
    Type Locality: Nkumbwa Hill Carbonatite (Nkombwa Hill Carbonatite), Isoka, Isoka District, Muchinga Mts., Northern Province, Zambia
    Reference: [Min.Mag.(1955) 30, 681-691]
  		•  Monazite-(Ce)
    (Ce,La,Nd,Th)PO
     
    4
    Reference: [Zambezi, P., Voncken, J.H.L., Hale, M., and Touret, J.L.R. (1997): Mineralogy and Petrology 59, 239-250.]
  		•  Phlogopite
    KMg
     
    3
    		[(OH,F)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    Reference: [Zambezi, P., Voncken, J.H.L., Hale, M., and Touret, J.L.R. (1997): Mineralogy and Petrology 59, 239-250.]
  		•  Pyrite
    FeS
     
    2
    Reference: []
  		•  Pyrochlore
    (Ca,Na)
     
    2
    		Nb
     
    2
    		O
     
    6
    		(OH,F)
    Reference: [Zambezi, P., Voncken, J.H.L., Hale, M., and Touret, J.L.R. (1997): Mineralogy and Petrology 59, 239-250.]
  		•  Sellaite
    MgF
     
    2
    Reference: [Zambezi, P., Voncken, J.H.L., Hale, M., and Touret, J.L.R. (1997): Mineralogy and Petrology 59, 239-250.]


    13 entries listed. 13 valid minerals. 1 type locality (valid mineral).

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