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Clementine II pegmatite, Okatjimukuju Farm 55 (Friedrichsfelde Farm), Karibib District, Erongo Region, Namibia

Stanĕkite
Clementine II pegmatite, Okatjimukuju Farm 55, Karibib District, Erongo Region, Namibia

Photo: Marek Patúš

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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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Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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