Nkumbwa Hill Carbonatite (Nkombwa Hill Carbonatite), Isoka, Isoka District, Muchinga Mts., Northern Province, Zambia
Latitude: 10°8'58"S
Longitude: 32°51'6"E
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.
References
- 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.
- Berger, V.I., Singer, D.A., and Orris, G.J. (2009): Carbonatites of the World. Explored Deposits of Nb and REE - Database and Grade and Tonnage Models. USGS Open-File Report 09-1139.
Mineral List
20 entries listed. 19 valid minerals. 1 type locality (valid mineral).
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