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Otjisumeite Mineral Data
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General Otjisumeite Information
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 Chemical Formula: |
PbGe4O9 |
| Composition: |
Molecular Weight = 641.63 gm |
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Germanium 45.27 % Ge 65.21 % GeO2 |
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Lead 32.29 % Pb 34.79 % PbO |
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Oxygen 22.44 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
PbGe4O9 |
| Environment: |
With other Ge-bearing minerals. |
| IMA Status: |
Approved IMA 1981 |
| Locality: |
Tsumeb mine, Namibia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the Herrero tribe name of the locality, Tsumeb. |
| Name Pronunciation: |
Otjisumeite + Pronunciation  |
| Synonym: |
ICSD 64910 |
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PDF 35-473 |
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Otjisumeite Crystallography
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| Axial Ratios: |
a:b:c =1.0554:1:1.4101 |
| 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 |
| Crystal System: |
Triclinic Space Group: P1,P 1 |
| X Ray Diffraction: |
By Intensity(I/Io): 2.95(1), 3.41(0.5), 4.2(0.4), |
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Physical Properties of Otjisumeite
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| Cleavage: |
{???} Indistinct |
| Color: |
Colorless, White. |
| Diaphaneity: |
Translucent |
| Habit: |
Pseudo Hexagonal - Crystals show a hexagonal outline. |
| Hardness: |
3 - Calcite |
| Luster: |
Subadamantine |
| Streak: |
white |
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Optical Properties of Otjisumeite
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| Gladstone-Dale: |
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1524,KC= 0.1552
Ncalc = 1.95 |
| Optical Data: |
Biaxial (+), a=1.92, b=1.922, g=1.943, bire=0.0230, 2V(Calc)=36, 2V(Meas)=20. |
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Calculated Properties of Otjisumeite
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| Electron Density: |
Bulk Density (Electron Density)=5.35 gm/cc
note: Specific Gravity of Otjisumeite =6.09 gm/cc.
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| Fermion Index: |
Fermion Index = 0.1
Boson Index = 0.9 |
| Photoelectric: |
PEOtjisumeite = 593.80 barns/electron
U=PEOtjisumeite x rElectron Density=3,178.71 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Otjisumeite is Not Radioactive |
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Otjisumeite Classification
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| Dana Class: |
07.10.03.01 (07)Multiple Oxides |
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(07.10)Dana Type |
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(07.10.03)Dana Group |
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07.10.03.01 Otjisumeite PbGe4O9 P1,P 1 Tri |
| Strunz Class: |
09.JA.15 09 - SILICATES (Germanates) |
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09.J - Germanates |
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09.JA -Germanates |
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09.JA.15 Otjisumeite PbGe4O9 P1,P 1 Tri |
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Other Otjisumeite Information
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| References: |
PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| 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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Print or Cut-and-Paste your Otjisumeite Specimen Label here :
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Otjisumeite
PbGe4O9
Dana No: 07.10.03.01 Strunz No: 09.JA.15
Locality:
Notes:
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