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Otjisumeite

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


Classification of Otjisumeite

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 Otjisumeite

Hardness (Mohs):
3

Optical Data of Otjisumeite

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 Otjisumeite

Formula:
PbGe4O9
Elements listed in formula:

Crystallography of Otjisumeite

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 Volume:
V 349.32 ų (Calculated from Unit Cell)
Comment:
Pseudo-hexagonal.

Type Occurrence of Otjisumeite

Relationship of Otjisumeite to other Species

9.J0.05CarboiriteFe2+Al2GeO5(OH)2
9.J0.10BartelkeitePbFeGe(Ge2O7)(OH)2 · H2O
7.11.1RomarchiteSnO
7.11.2CassiteriteSnO2
7.11.4SchoenfliesiteMgSn(OH)6
7.11.5BurtiteCaSn4+(OH)6
7.11.6VismirnoviteZnSn(OH)6
7.11.7WickmaniteMn2+Sn4+(OH)6
7.11.8TetrawickmaniteMn2+Sn4+(OH)6
7.11.9Jeanbandyite(Fe3+,Mn2+)Sn4+(OH,O)6
7.11.10NataniteFe2+Sn4+(OH)6
7.11.11MushistoniteCu2+Sn4+(OH)6
7.11.12Ferronigerite-2N1S(Al,Fe,Zn)2(Al,Sn)6O11(OH)
7.11.13Magnesionigerite
7.11.14ArgutiteGeO2
7.11.15BrunogeieriteFe22+Ge4+O4
7.11.16StottiteFe2+Ge4+(OH)6
7.11.17CarboiriteFe2+Al2GeO5(OH)2
7.11.19BartelkeitePbFeGe(Ge2O7)(OH)2 · H2O
7.11.20MassicotPbO
7.11.21LithargePbO
7.11.22MiniumPb22+Pb4+O4
7.11.23PlattneritePbO2
7.11.24ScrutinyitePbO2
7.11.25MurdochiteCu12Pb2O15Cl2
7.11.26MacedonitePbTiO3
7.11.27CesàrolitePbMn34+O6(OH)2
7.11.28CoronaditePb(Mn64+Mn23+)O16
7.11.29QuenselitePbMn3+O2(OH)
7.11.30PlumboferritePb2(Fe3+,Mn2+,Mg)11O19
7.11.31MagnetoplumbitePbFe123+O19
7.11.32SenaitePb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38

Other Names for Otjisumeite

Name in Other Languages:
German:Otjisumeit
Spanish:Otjisumeita

Other Information

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 Otjisumeite

Reference List:
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 Otjisumeite

mindat.org URL:
https://www.mindat.org/min-3041.html
Please feel free to link to this page.

Localities for Otjisumeite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Namibia (TL)
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Neues Jahrb.Min.,Mh.(1981) 49-55
Mineral and/or Locality  
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