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

Albite
'Alkali Feldspar'
Alluaudite
'Amblygonite-Montebrasite Series'
Arrojadite-(KFe)
Barbosalite
Bermanite
Beryl
Beyerite
Bismite
Bismuth
Bismutite
Cacoxenite
Collinsite
'Columbite'
Dufrénite
Eosphorite
Ferrisicklerite
'Ferrisicklerite-Sicklerite Series'
Fluorapatite
var: Mn-bearing Fluorapatite
Gahnite
Heterosite
'Heterosite-Purpurite Series'
Hureaulite
'Jahnsite'
Kidwellite
Kryzhanovskite
Laueite
Lepidolite
Leucophosphite
Lipscombite
'Lithiophilite-Triphylite Series'
Magnetite
Microcline
Microlite Group
Mitridatite
Muscovite
'Perthite'
Petalite
Phosphosiderite
Quartz
Rockbridgeite
Stanĕkite (TL)
Stewartite
Strunzite
Tavorite
Topaz
'Tourmaline'
Triphylite
Triplite
Uraninite
Whitlockite
Zircon
Zwieselite


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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