stripes
Although this occurrence has been investigated as a potential source of rare earths, few detailed geological descriptions are available. Wigu Hill consists of Precambrian gneisses which are cut and fenitized by a system of intersecting dolomitic dykes together with explosion vents of carbonatite and fenite breccias. Although most of the dykes are dolomitic some sovite also occurs; most dykes contain fenite xenoliths. The main minerals of the carbonatites are dolomite and calcite with barite, celestite, bastnasite, monazite, cerian goyazite, quartz and minor pyrite and sphalerite. The cerian goyazite is described by McKie (1962).
DEANS, T. 1966. Economic mineralogy of African carbonatites. In O.F. Tuttle and J.Gittins (eds), Carbonatites, 385-413. John Wiley, New York. GITTINS, J. 1966. Summaries and bibliographies of carbonatite complexes. In: O.F. Tuttle and J. Gittins (eds), Carbonatites. 417-541. John Wiley, New York. Geological Survey of Tanganyika, Memoir, 2: 1-172.HARRIS, J.F. 1961. Summary of the geology of Tanganyika. Part IV: Economic geology. Memoir, Geological Survey of Tanganyika, 1: 1-143.MCKIE, D. 1962. Goyazite and florencite from two African carbonatites. Mineralogical Magazine, 33: 281-97.