Kegelite
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About Kegelite
Formula:
Pb8Al4(Si8O20)(SO4)2(CO3)4(OH)8
Colour:
Colorless
Specific Gravity:
4.5
Crystal System:
Monoclinic
Name:
Named in 1975 by Olaf Medenbach and Karl Schmetzer in honor of Friedrich Wilhelm Kegel [1874 Hettstedt, eastern Harz, Mansfeld-Südharz, Sachsen-Anhalt, Germany - 8 August, 1948 Landschlacht, Münsterlingen, Kreuzlingen, Thurgau, Switzerland], Director of mining operations (1922-1938) at Tsumeb, Namibia.
Type Locality:
This page provides mineralogical data about Kegelite.
Classification of Kegelite
Approved
IMA status notes:
Redefined by the IMA
First published:
1975
Approval history:
Approved by IMA (IMA 1974-042) as Pb12(Zn,Fe)2Al4Si11S4O54
1990: Redefined by IMA as Pb4Al8Si8(SO4)2(CO3)4(OH)8O20, monoclinic (Dunn et al. 1990)
1990: Redefined by IMA as Pb4Al8Si8(SO4)2(CO3)4(OH)8O20, monoclinic (Dunn et al. 1990)
8/H.09-70
9.EC.80
9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
71.5.1.1
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
5 : Sheets of 6-membered rings with other anions
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
5 : Sheets of 6-membered rings with other anions
17.10.27
17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate
17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate
Physical Properties of Kegelite
Transparency:
Transparent, Translucent
Colour:
Colorless
Streak:
White
Tenacity:
Flexible
Cleavage:
Perfect
{100}
{100}
Density:
4.5 g/cm3 (Measured) 4.76 g/cm3 (Calculated)
Optical Data of Kegelite
Type:
Biaxial (-)
Dispersion:
r > v
Chemical Properties of Kegelite
Formula:
Pb8Al4(Si8O20)(SO4)2(CO3)4(OH)8
IMA Formula:
Pb4Al2Si4O10(SO4)(CO3)2(OH)4
Common Impurities:
Cu,H2O
Crystallography of Kegelite
Crystal System:
Monoclinic
Cell Parameters:
a = 21.04(1) Å, b = 15.55(1) Å, c = 8.986(6) Å
β = 91.0(1)°
β = 91.0(1)°
Ratio:
a:b:c = 1.353 : 1 : 0.578
Unit Cell V:
2,939.52 ų (Calculated from Unit Cell)
Z:
3
Comment:
A2/m, A2, or Am
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
21.0 Å | (100) |
10.5 Å | (20) |
7.01 Å | (50) |
4.49 Å | (30) |
4.39 Å | (20b) |
4.09 Å | (10) |
3.82 Å | (80) |
3.74 Å | (40) |
3.51 Å | (15) |
3.45 Å | (20) |
3.006 Å | (50) |
2.934 Å | (20) |
2.815 Å | (10) |
2.747 Å | (10) |
2.591 Å | (90) |
2.531 Å | (10) |
2.339 Å | (50) |
2.242 Å | (30) |
2.156 Å | (15) |
2.085 Å | (10) |
Comments:
Dunn et al. 1990, redefinition.
Type Occurrence of Kegelite
Geological Setting of Type Material:
Oxidation zone hydrothermal deposit
Associated Minerals at Type Locality:
Reference:
Medenbach, O., Schmetzer, K. (1975) Kegelite - ein neues Bleisilikat von Tsumeb. Naturwissenschaften: 62: 137.
Other Language Names for Kegelite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Nickel-Strunz Grouping
9.EC. | Balestraite | KLi2V5+Si4O12 | Mon. 2 : B2 |
9.EC.05 | Minnesotaite | Fe2+3Si4O10(OH)2 | Tric. 1 : P1 |
9.EC.05 | Talc | Mg3Si4O10(OH)2 | Tric. 1 : P1 |
9.EC.05 | Willemseite | Ni3Si4O10(OH)2 | Mon. |
9.EC.9.EC. | Voloshinite | Rb(LiAl1.5◻1.5)(Al0.5Si3.5)O10F2 | Mon. 2/m : B2/b |
9.EC.10 | Ferripyrophyllite | Fe3+Si2O5(OH) | Mon. |
9.EC.10 | Pyrophyllite | Al2Si4O10(OH)2 | Tric. 1 |
9.EC.15 | Boromuscovite | KAl2(BSi3O10)(OH)2 | Mon. |
9.EC.15 | Celadonite | K(Mg,Fe2+)Fe3+(Si4O10)(OH)2 | Mon. 2/m : B2/m |
9.EC.15 | Chernykhite | (Ba,Na)(V3+,Al,Mg)2((Si,Al)4O10)(OH)2 | Mon. |
9.EC.15 | Montdorite | (K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4 | Mon. 2/m : B2/m |
9.EC.15 | Muscovite | KAl2(AlSi3O10)(OH)2 | Mon. 2/m : B2/b |
9.EC.15 | Nanpingite | CsAl2(AlSi3O10)(OH,F)2 | Mon. |
9.EC.15 | Paragonite | NaAl2(AlSi3O10)(OH)2 | Mon. |
9.EC.15 | Roscoelite | K(V3+,Al)2(AlSi3O10)(OH)2 | Mon. 2/m : B2/b |
9.EC.15 | Tobelite | (NH4,K)Al2(AlSi3O10)(OH)2 | Mon. |
9.EC.15 | Aluminoceladonite | K(Mg,Fe2+)Al(Si4O10)(OH)2 | Mon. |
9.EC.15 | Chromphyllite | K(Cr,Al)2(AlSi3O10)(OH,F)2 | Mon. 2/m : B2/b |
9.EC.15 | Ferroaluminoceladonite | K(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2 | Mon. 2/m : B2/m |
9.EC.15 | Ferroceladonite | K(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2 | Mon. 2/m : B2/m |
9.EC.15 | Chromceladonite | K(Mg,Fe2+)(Cr,Al)(Si4O10)(OH)2 | Mon. |
9.EC.15 | Tainiolite | KLiMg2(Si4O10)F2 | Mon. |
9.EC.15 | Ganterite | (Ba,Na,K)(Al,Mg)2(AlSi3O10)(OH)2 | Mon. |
9.EC.20 | Annite | KFe2+3(AlSi3O10)(OH)2 | Mon. 2/m : B2/m |
9.EC.20 | Ephesite | NaLiAl2(Al2Si2O10)(OH)2 | Tric. |
9.EC.20 | Hendricksite | KZn3(Si3Al)O10(OH)2 | Mon. 2/m : B2/m |
9.EC.20 | Masutomilite | (K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2 | Mon. |
9.EC.20 | Norrishite | KLiMn3+2(Si4O10)O2 | Mon. 2/m : B2/m |
9.EC.20 | Phlogopite | KMg3(AlSi3O10)(OH)2 | Mon. 2/m : B2/m |
9.EC.20 | Polylithionite | KLi2Al(Si4O10)(F,OH)2 | Mon. 2/m : B2/b |
9.EC.20 | Preiswerkite | NaMg2Al(Al2Si2O10)(OH)2 | Mon. |
9.EC.20 | Siderophyllite | KFe2+2Al(Al2Si2O10)(OH)2 | Mon. |
9.EC.20 | Tetraferriphlogopite | KMg3(Fe3+Si3O10)(OH,F)2 | |
9.EC.20 | Fluorotetraferriphlogopite | KMg3(Fe3+Si3O10)F2 | Mon. 2/m : B2/m |
9.EC.20 | Wonesite | (Na,K)(Mg,Fe,Al)6((Al,Si)4O10)2(OH,F)4 | Mon. 2/m : B2/m |
9.EC.20 | Eastonite | KMg2Al(Al2Si2O10)(OH)2 | Mon. |
9.EC.20 | Tetraferriannite | KFe2+3(Si3Fe3+)O10(OH)2 | Mon. |
9.EC.20 | Trilithionite | K(Li1.5Al1.5)(AlSi3O10)(F,OH)2 | Mon. 2/m : B2/b |
9.EC.20 | Fluorannite | KFe2+3(Si3Al)O10F2 | Mon. |
9.EC.20 | Shirokshinite | KNaMg2(Si4O10)F2 | Mon. 2/m : B2/m |
9.EC.20 | Shirozulite | KMn2+3(Si3Al)O10(OH)2 | Mon. 2/m : B2/m |
9.EC.20 | Sokolovaite | CsLi2Al(Si4O10)F2 | Mon. |
9.EC.20 | Aspidolite | NaMg3(AlSi3O10)(OH)2 | Mon. 2/m : B2/m |
9.EC.20 | Fluorophlogopite | KMg3(Si3Al)O10F2 | Mon. 2/m : B2/m |
9.EC.20 | UM2004-49-SiO:AlCsFHKLi | (Cs,K)(Al,Li)2.6((Si,Al)4O10)(F,OH)2 | |
9.EC.20 | Suhailite | (NH4)Fe2+3(AlSi3O10)(OH)2 | Mon. 2/m : B2/m |
9.EC.20 | Yangzhumingite | KMg2.5(Si4O10)F2 | Mon. 2/m : B2/m |
9.EC.20 | Orlovite | KLi2Ti(Si4O10)OF | Mon. 2 : B2 |
9.EC.20 | Oxyphlogopite | K(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2 | Mon. 2/m : B2/m |
9.EC.30 | Margarite | CaAl2(Al2Si2O10)(OH)2 | Mon. |
9.EC.35 | Anandite | (Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2 | Mon. 2/m : B2/b |
9.EC.35 | Bityite | LiCaAl2(AlBeSi2O10)(OH)2 | Mon. 2/m : B2/b |
9.EC.35 | Clintonite | CaAlMg2(SiAl3O10)(OH)2 | Mon. 2/m : B2/m |
9.EC.35 | Kinoshitalite | (Ba,K)(Mg,Mn2+,Al)3(Al2Si2O10)(OH)2 | Mon. |
9.EC.35 | Ferrokinoshitalite | (Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2 | Mon. |
9.EC.35 | Oxykinoshitalite | (Ba,K)(Mg,Ti,Fe3+,Fe2+)3((Si,Al)4O10)(O,OH,F)2 | Mon. 2/m : B2/m |
9.EC.35 | Fluorokinoshitalite | BaMg3(Al2Si2O10)F2 | Mon. 2/m : B2/m |
9.EC.40 | Beidellite | (Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O | Mon. |
9.EC.40 | Kurumsakite | (Zn,Ni,Cu)8Al8V5+2Si5O35 · 27H2O (?) | Orth. |
9.EC.40 | Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O | Mon. 2/m : B2/m |
9.EC.40 | Nontronite | Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O | Mon. |
9.EC.40 | Volkonskoite | Ca0.3(Cr,Mg,Fe)2((Si,Al)4O10)(OH)2 · 4H2O | Mon. |
9.EC.40 | Yakhontovite | (Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 · 3H2O | Mon. |
9.EC.45 | Hectorite | Na0.3(Mg,Li)3(Si4O10)(F,OH)2 | Mon. |
9.EC.45 | Saponite | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O | Mon. |
9.EC.45 | Sauconite | Na0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O | Mon. |
9.EC.45 | Spadaite | MgSiO2(OH)2 · H2O (?) | |
9.EC.45 | Stevensite | (Ca,Na)xMg3-x(Si4O10)(OH)2 | Mon. |
9.EC.45 | Swinefordite | Li(Al,Li,Mg)4((Si,Al)4O10)2(OH,F)4 · nH2O | Mon. |
9.EC.45 | Zincsilite | Zn3Si4O10(OH)2 · 4H2O (?) | Mon. |
9.EC.45 | Ferrosaponite | Ca0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O | Mon. |
9.EC.50 | Vermiculite | Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O | Mon. 2/m |
9.EC.55 | Baileychlore | (Zn,Fe2+,Al,Mg)6(Si,Al)4O10(OH)8 | Tric. 1 |
9.EC.55 | Chamosite | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 | Mon. |
9.EC.55 | Clinochlore | Mg5Al(AlSi3O10)(OH)8 | Mon. 2/m : B2/m |
9.EC.55 | Cookeite | (Al,Li)3Al2(Si,Al)4O10(OH)8 | Mon. 2/m |
9.EC.55 | Franklinfurnaceite | Ca2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8 | Mon. 2 : B2 |
9.EC.55 | Gonyerite | (Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8 | Orth. |
9.EC.55 | Nimite | (Ni,Mg,Al)6((Si,Al)4O10)(OH)8 | Mon. |
9.EC.55 | Orthochamosite | (Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8 | |
9.EC.55 | Pennantite | Mn2+5Al(AlSi3O10)(OH)8 | Tric. |
9.EC.55 | Sudoite | Mg2Al3(Si3Al)O10)(OH)8 | Mon. |
9.EC.55 | Donbassite | Al2(Si3Al)O10(OH)2 · Al2.33(OH)6 | Mon. 2 : B2 |
9.EC.55 | Glagolevite | Na(Mg,Al)6(AlSi3O10)(OH,O)8 | Tric. 1 : P1 |
9.EC.55 | Borocookeite | LiAl4(Si3B)O10(OH)8 | |
9.EC.60 | Aliettite | Ca0.2Mg6((Si,Al)8O20)(OH)4 · 4H2O | Mon. |
9.EC.60 | Corrensite | (Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O | Orth. |
9.EC.60 | Dozyite | Mg7Al2(Al2Si4O15)(OH)12 | Mon. |
9.EC.60 | Hydrobiotite | K(Mg,Fe2+)6((Si,Al)8O20)(OH)4 · nH2O | Mon. |
9.EC.60 | Karpinskite | (Ni,Mg)2Si2O5(OH)2 (?) | Mon. |
9.EC.60 | Kulkeite | Mg8Al(AlSi7O20)(OH)10 | Mon. |
9.EC.60 | Lunijianlaite | Li0.7Al6.2(AlSi7O20)(OH,O)10 | Mon. |
9.EC.60 | Rectorite | (Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O | Mon. |
9.EC.60 | Saliotite | (Li,Na)Al3(AlSi3O10)(OH)5 | Mon. |
9.EC.60 | Tosudite | Na0.5(Al,Mg)6((Si,Al)8O18)(OH)12 · 5H2O | Mon. 2 : B2 |
9.EC.60 | Brinrobertsite | Na0.3Al4(Si4O10)2(OH)4 · 3.5 H2O | Mon. |
9.EC.65 | Macaulayite | (Fe,Al)24Si4O43(OH)2 | Mon. |
9.EC.70 | Burckhardtite | Pb2(Fe3+Te6+)[AlSi3O8]O6 | Trig. 3m (3 2/m) : P3 1m |
9.EC.75 | Ferrisurite | (Pb,Ca)2.4Fe3+2(Si4O10)(CO3)1.7(OH)3 · nH2O | Mon. |
9.EC.75 | Surite | (Pb,Ca)3(Al,Fe2+,Mg)2((Si,Al)4O10)(CO3)2(OH)2 | Mon. |
9.EC.75 | Niksergievite | (Ba,Ca)2Al3(AlSi3O10)(CO3)(OH)6 · nH2O | Mon. |
Related Minerals - Hey's Chemical Index of Minerals Grouping
17.10.1 | Nosean | Na8(Al6Si6O24)(SO4) · H2O | Iso. 4 3m : P4 3n |
17.10.2 | Pitiglianoite | Na6K2(Al6Si6O24)(SO4) · 2H2O | Hex. |
17.10.3 | Vishnevite | (Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2O | Hex. 6 : P63 |
17.10.4 | Haüyne | (Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl) | Iso. 4 3m : P4 3n |
17.10.5 | Liottite | (Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4 | Hex. 6 : P6 |
17.10.6 | Latiumite | (Ca,K)4(Si,Al)5O11(SO4,CO3) | Mon. |
17.10.7 | Tuscanite | (K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O | Mon. |
17.10.8 | Microsommite | Na4K2Ca2(Al6Si6O24)(SO4)Cl2 | Hex. |
17.10.9 | Delhayelite | (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 · 18H2O | Orth. |
17.10.10 | Hydrodelhayelite | KCa2AlSi7O17(OH)2 · 6H2O | Orth. |
17.10.11 | Davyne | (Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2 | Hex. 6/m : P63/m |
17.10.12 | Afghanite | (Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6 | Trig. 3m : P3 1c |
17.10.13 | Franzinite | (Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2O | Hex. |
17.10.14 | Giuseppettite | (Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2 | Trig. 3m : P3 1c |
17.10.15 | Sacrofanite | (Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6 · 2H2O | Hex. |
17.10.16 | Chessexite | (Na,K)4Ca2(Mg,Zn)3Al8(SO4)10(SiO4)2 · 40H2O | Orth. |
17.10.17 | Innelite | Na2CaBa4Ti3(Si2O7)2(SO4)2O4 | Tric. 1 : P1 |
17.10.18 | Thaumasite | Ca3(SO4)[Si(OH)6](CO3) · 12H2O | Hex. 6 : P63 |
17.10.19 | Ellestadite | ||
17.10.20 | Chlorellestadite | Ca5(SiO4)1.5(SO4)1.5Cl | Hex. 6/m : P63/m |
17.10.21 | Hydroxylellestadite | Ca5(SiO4)1.5(SO4)1.5(OH) | Hex. 6/mmm (6/m 2/m 2/m) : P63/mcm |
17.10.22 | Fluorellestadite | Ca5(SiO4)1.5(SO4)1.5F | Hex. 6/m : P63/m |
17.10.23 | Mattheddleite | Pb5(SiO4)1.5(SO4)1.5(Cl,OH) | Hex. 6/m : P63/m |
17.10.24 | Queitite | Pb4Zn2(SO4)(SiO4)(Si2O7) | Mon. 2 : P21 |
17.10.25 | Roeblingite | Pb2Ca6Mn2+(Si3O9)2(SO4)2(OH)2 · 4H2O | Mon. 2/m : B2/m |
17.10.26 | Yoshimuraite | Ba2Mn2Ti(Si2O7)(PO4)O(OH) | Tric. 1 : P1 |
17.10.28 | Wenkite | (Ba,K)4(Ca,Na)6[(Si,Al)20O39(OH)2](SO4)3 · 0.5H2O | Hex. |
17.10.29 | Macquartite | Cu2Pb7(CrO4)4(SiO4)2(OH)2 | Mon. |
17.10.30 | Welinite | Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6 | Trig. 3 : P3 |
Other Information
Notes:
Insoluble in HCl
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Kegelite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Medenbach, O., Schmetzer, K. (1975) Kegelite - ein neues Bleisilikat von Tsumeb. Naturwissenschaften: 62: 137. (in German with English abstract)
Fleischer, M., Pabst, A., Mandarino, J.A., Chao, G.Y., Cabri, L.J. (1976) New mineral names. American Mineralogist: 61: 174-186 (175-176).
Medenbach, O., Schmetzer, K. (1976) Kegelite - ein neues Bleisilikat von Tsumeb. Neues Jahrbuch für Mineralogie, Monatshefte: 110-114. (in German)
Fleischer, M., Mandarino, J.A. (1977) New mineral names. American Mineralogist: 62: 173-176 (155).
Dunn, P.J., Braithwaite, R.S.W., Roberts, A.C., and Ramik, R.A. (1990) Kegelite from Tsumeb, Namibia: A redefinition. American Mineralogist: 75: 702-704.
Braithwaite, R.S.W. (1991) Kegelite: infrared spectroscopy and a structural hypothesis. Mineralogical Magazine: 55: 127-134.
Raade, G. (1993) Caledonite and kegelite from Minge, Tune, Østfold. Interne notater 1990 - 1993, Mineralogisk-Geologisk Museum Universitetet i Oslo. Printed by Geologisk Museums Venner, 1993: 164-165.
Neall, T., Green, D.I. (2008) Kegelite, a first British occurrence, from Wanlockhead, Dumfries and Galloway, Scotland. Journal of the Russell Society: 8: 110-111.
Internet Links for Kegelite
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https://www.mindat.org/min-2175.html
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Localities for Kegelite
Locality List




All localities listed without proper references should be considered as questionable.
Australia | |
| Bottrill, R.S., Baker, W.E. (2008) A Catalogue of the Minerals of Tasmania. Geological Survey Tasmania Bulletin 73, 254 pages. |
Namibia (TL) | |
| Medenbach, O., Schmetzer, K. (1975) Kegelite - ein neues Bleisilikat von Tsumeb. Naturwissenschaften: 62: 137.; Dunn, P.J., Braithwaite, R.S.W., Roberts, A.C., and Ramik, R.A. (1990) Kegelite from Tsumeb, Namibia: A redefinition. American Mineralogist: 75: 702-704. |
Norway | |
| Raade, G. (1993): Caledonite and kegelite from Minge, Tune, Østfold. Interne notater 1990 - 1993, Mineralogisk-Geologisk Museum Universitetet i Oslo. Printed by Geologisk Museums Venner, 1993, pp. 164-165.; Michaelsen, A. (2019) Mineralene fra Minge blygruve, Sarpsborg, Østfold. Norsk Mineralsymposium: 71-81 |
UK | |
| Neall, T., Green, D.I. (2008) Kegelite, a first British occurrence, from Wanlockhead, Dumfries and Galloway, Scotland. Journal of the Russell Society: 8: 110-111. |
Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia