StanĕkiteClementine II pegmatite, Okatjimukuju Farm 55, Karibib District, Erongo Region, Namibia
Photo: Marek Patúš Well-zoned pegmatitic dyke hosted in calc-silicates rocks (foot wall) and dolomitic marbles (hanging wall) of the Upper Precambrian Damara sequence.
Located 18 kilometers ESE of Karibib, located in the SE area of Okatjimukuju 55, approx 2 km from the perimeter with Okongava Ost.
Zonation of the pegmatite:
- Wall zone: aplite (muscovite, quartz).
- Outer intermediate zone: aplite gives way to coarse-grained quartz-alkaline feldspar-muscovite association.
Microcline perthite towards the core.
- Intercalated zone: Early space filling with quartz-muscovite-feldspar pegmatite rich in beryl, columbite, amblygonite-montebrasite, apatite (Mn) and Fe-Mn phosphates.
Quartz-albite-muscovite rock (zonation of the pegmatite).
- Inner intermediate zone: Red microcline perthite (crystals up to 1 meter long) rimmed by muscovite. Quartz + muscovite in interstices.
- Replacement unit: pink/grey Li-mica with petalite, albite and microlite.
- Quartz core (milky quartz).
Mineral List
55 entries listed. 45 valid minerals. 1 type locality (valid mineral).
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References
Keller, P. & von Knorring, O. (1989): Pegmatites at the Okatjimukuju farm, Karibib, Namibia. Part I: Phosphate mineral associations of the Clementine II pegmatite. Eur. J. Mineral., 1, 567-593.
Keller, P., Fontan, F., Velasco-Roldan, F., Melgarejo i Draper, J. C. (1997): Stanĕkite, Fe3+(Mn,Fe2+,Mg)(PO4)O: a new phosphate mineral in pegmatites at Karibib (Namibia) and French Pyrénées (France). European Journal of Mineralogy 9, 475-482.
Bezing, L. von, Bode, R. & Jahn, S. (2007): Namibia. Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag, Haltern, 410 pp. (in English)
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