Otjisumeite Mineral Data

General Otjisumeite Information

Chemical Formula:

PbGe4O9

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

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

PDF 35-473

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Otjisumeite Crystallography

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:

TriclinicSpace Group: P1,P 1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.95(1), 3.41(0.5), 4.2(0.4),

Physical Properties of Otjisumeite

Cleavage:

{???} Indistinct

Color:

Colorless, White.

Diaphaneity:

Translucent

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

3 - Calcite

Luster:

Subadamantine

Streak:

white

Optical Properties of Otjisumeite

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.

Calculated Properties of Otjisumeite

Electron Density:

Bulk Density (Electron Density)=5.35 gm/cc
note: Specific Gravity of Otjisumeite =6.09 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Otjisumeite= 593.80 barns/electron
U=PE_Otjisumeite x rElectron Density=3,178.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Otjisumeite is Not Radioactive

Otjisumeite Classification

Dana Class:

07.10.03.01 (07)Multiple Oxides

(07.10)Dana Type

(07.10.03)Dana Group

07.10.03.01 Otjisumeite PbGe4O9 P1,P 1 Tri

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

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 :

Otjisumeite

PbGe4O9
Dana No: 07.10.03.01 Strunz No: 09.JA.15
Locality:

Notes: