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Otjisumeite

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Formula:
PbGe4O9
Hardness:
3
Crystal System:
Triclinic
Name:
From Otjisume, the Herero name for Tsumeb, Namibia.
This page provides mineralogical data about Otjisumeite.


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Classification of OtjisumeiteHide

Approved
9.J0.15

9 : SILICATES (Germanates)
J : Germanates
0 :
7.10.3.1

7 : MULTIPLE OXIDES
10 : AB4X9
7.11.18

7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb

Physical Properties of OtjisumeiteHide

Hardness:

Optical Data of OtjisumeiteHide

Type:
Biaxial (+)
RI values:
nα = 1.920 nβ = 1.922 nγ = 1.943
2V:
Measured: 20° , Calculated: 36°
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
none

Chemical Properties of OtjisumeiteHide

Formula:
PbGe4O9

Crystallography of OtjisumeiteHide

Crystal System:
Triclinic
Cell Parameters:
a = 6.94 Å, b = 6.58 Å, c = 9.27 Å
α = 102.94°, β = 103.05°, γ = 114.77°
Ratio:
a:b:c = 1.055 : 1 : 1.409
Unit Cell V:
349.32 ų (Calculated from Unit Cell)
Comment:
Pseudo-hexagonal.

Type Occurrence of OtjisumeiteHide

Synonyms of OtjisumeiteHide

Other Language Names for OtjisumeiteHide

German:Otjisumeit
Spanish:Otjisumeita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Plumbogummite3 photos of Otjisumeite associated with Plumbogummite on mindat.org.
Chalcocite1 photo of Otjisumeite associated with Chalcocite on mindat.org.
Germanite1 photo of Otjisumeite associated with Germanite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.J0.05CarboiriteFeAl2(GeO4)O(OH)2Tric.
9.J0.10BartelkeitePb(Fe2+Ge)[Ge2O7](OH)2 · H2OMon. 2/m : P21/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.11.1RomarchiteSnOTet.
7.11.2CassiteriteSnO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
7.11.4SchoenfliesiteMg[Sn(OH)6]Iso. m3 (2/m 3) : Pn3
7.11.5BurtiteCa[Sn(OH)6]Iso.
7.11.6VismirnoviteZn[Sn(OH)6]Iso.
7.11.7WickmaniteMn2+[Sn(OH)6]Iso. m3 (2/m 3) : Pn3
7.11.8TetrawickmaniteMn2+[Sn4+(OH)6]Tet. 4/m : P42/n
7.11.9JeanbandyiteFe3+xFe2+1-xSn(OH)6-xOx (1 ≥ x > 0.5)Tet. 4/m : P42/n
7.11.10NataniteFe2+[Sn(OH)6]Iso. m3m (4/m 3 2/m) : Pn3m
7.11.11Mushistonite(Cu,Zn,Fe2+)[Sn(OH)6]
7.11.12Ferronigerite-2N1S(Al,Fe,Zn)2(Al,Sn)6O11(OH)Trig. 3m (3 2/m) : P3m1
7.11.13MagnesionigeriteTrig.
7.11.14ArgutiteGeO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
7.11.15BrunogeieriteFe2+2Ge4+O4Iso. m3m (4/m 3 2/m) : Fd3m
7.11.16StottiteFe2+[Ge4+(OH)6]Tet.
7.11.17CarboiriteFeAl2(GeO4)O(OH)2Tric.
7.11.19BartelkeitePb(Fe2+Ge)[Ge2O7](OH)2 · H2OMon. 2/m : P21/m
7.11.20MassicotPbOOrth. mmm (2/m 2/m 2/m) : Cmmm
7.11.21LithargePbOTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
7.11.22MiniumPb3O4Tet. 4/mmm (4/m 2/m 2/m) : P42/mbc
7.11.23PlattneritePbO2Tet. 4/mmm (4/m 2/m 2/m)
7.11.24Scrutinyiteα-PbO2Orth.
7.11.25MurdochitePbCu6O8-x(Cl,Br)2x where x<=0.5Iso. m3m (4/m 3 2/m) : Fm3m
7.11.26MacedonitePbTiO3Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
7.11.27CesàrolitePb(Mn4+)3O6(OH)2
7.11.28CoronaditePb(Mn4+6Mn3+2)O16Mon. 2/m
7.11.29QuenselitePbMnO2(OH)Mon. 2/m : P2/b
7.11.30PlumboferritePb2(Fe3+,Mn2+,Mg)11O19Trig. 3 2
7.11.31Magnetoplumbite(Pb,Mn)(Fe,Mn)12O19Hex.
7.11.32SenaitePb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38Trig.

Other InformationHide

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 OtjisumeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Keller, P., H. Hess, and P.J. Dunn (1981): Otjisumeit, PbGe4O9, ein neues
Mineral aus Tsumeb, Namibia. Neues Jahrb. Mineral., Monatsh., 49–55 (in German with English abs.).
American Mineralogist (1987): 72: 1026-1027. (Abs.)
Shashkov, A. Yu., Rannev, N. V., Venevtsev, Yu. N. (1984): Atomic structure of crystals of α-(PbGe4O9), BaGe4O9, and Pb2/3Sr1/3Ge4O9 and features of the coordination of germanium atoms in framework tetragermanates. Soviet Journal of Coordination Chemistry 10, 1420-1426.

Internet Links for OtjisumeiteHide

Localities for OtjisumeiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Namibia (TL)
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Neues Jahrb.Min.,Mh.(1981) 49-55
Mineral and/or Locality  
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