Mineralogy Database

Otjisumeite Mineral Data

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General Otjisumeite Information

Help on Chemical  Formula: Chemical Formula: PbGe4O9
Help on Composition: Composition: Molecular Weight = 641.63 gm
   Germanium  45.27 %  Ge   65.21 % GeO2
   Lead       32.29 %  Pb   34.79 % PbO
   Oxygen     22.44 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: PbGe4O9
Help on Environment: Environment: With other Ge-bearing minerals.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Tsumeb mine, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Herrero tribe name of the locality, Tsumeb.
Help on Name Pronunciation: Name Pronunciation: Otjisumeite + Pronunciation Say OTJISUMEITE
Help on Synonym: Synonym: ICSD 64910
  PDF 35-473

Otjisumeite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0554:1:1.4101
Help on Cell Dimensions: Cell Dimensions: a = 6.945, b = 6.58, c = 9.279, Z = 2; alpha = 102.94°, beta = 103.05°, gamma = 114.77° V = 365.55 Den(Calc)= 5.83
Help on Crystal System: Crystal System: Triclinic Space Group: P1,P 1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.95(1), 3.41(0.5), 4.2(0.4),

Physical Properties of Otjisumeite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Colorless, White.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Subadamantine
Help on Streak: Streak: white

Optical Properties of Otjisumeite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1524,KC= 0.1552
Ncalc = 1.95
Help on Optical Data: Optical Data: Biaxial (+), a=1.92, b=1.922, g=1.943, bire=0.0230, 2V(Calc)=36, 2V(Meas)=20.

Calculated Properties of Otjisumeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.35 gm/cc
note: Specific Gravity of Otjisumeite =6.09 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.1
Boson Index = 0.9
Help on Photoelectric: Photoelectric: PEOtjisumeite = 593.80 barns/electron
U=PEOtjisumeite x rElectron Density=3,178.71 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Otjisumeite is Not Radioactive

Otjisumeite Classification

Help on  Dana Class: Dana Class: (07)Multiple Oxides
  (07.10)Dana Type
  (07.10.03)Dana Group Otjisumeite PbGe4O9 P1,P 1 Tri
Help on  Strunz Class: Strunz Class: 09.JA.15 09 - SILICATES (Germanates)
  09.J - Germanates
  09.JA -Germanates
09.JA.15 Otjisumeite PbGe4O9 P1,P 1 Tri

Other Otjisumeite Information

Help on References: References: PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Otjisumeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.JA.15





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