Bartelkeite Mineral Data

General Bartelkeite Information

Chemical Formula:

PbFe++Ge3O8

Composition:

Molecular Weight = 608.87 gm

Iron 9.17 % Fe 11.80 % FeO

Germanium 35.78 % Ge 51.54 % GeO₂

Lead 34.03 % Pb 36.66 % PbO

Oxygen 21.02 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbFe²⁺Ge₃O₈

Environment:

Primary ore cavities with other Ge-bearing minerals.

IMA Status:

Approved IMA 1981

Locality:

Tsumeb, Namibia. Link to MinDat.org Location Data.

Name Origin:

Named for Wolfgang Bartelke, mineral collector and specialist in Tsumeb mineral.

Name Pronunciation:

Bartelkeite + Pronunciation

Bartelkeite Crystallography

Axial Ratios:

a:b:c =0.3967:1:0.4304

Cell Dimensions:

a = 5.431, b = 13.689, c = 5.892, Z = 2; beta = 111.48° V = 407.62 Den(Calc)= 4.96

Crystal System:

Monoclinic Space Group: P 2₁,P 2₁/m

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

By Intensity(I/I_o): 2.91(1), 2.87(0.8), 4.42(0.8),

Physical Properties of Bartelkeite

Cleavage:

{101} Distinct

Color:

Colorless, Light green.

Density:

4.97

Diaphaneity:

Transparent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4 - Fluorite

Streak:

white

Optical Properties of Bartelkeite

Gladstone-Dale:

CI meas= -0.157 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.159 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.182,KPDmeas= 0.1816,KC= 0.157
Ncalc = 1.78

Optical Data:

Biaxial (-), a=1.885, b=1.91, g=1.913, bire=0.0280, 2V(Calc)=36, 2V(Meas)=~35. Dispersion r > v.

Calculated Properties of Bartelkeite

Electron Density:

Bulk Density (Electron Density)=4.38 gm/cc
note: Specific Gravity of Bartelkeite =4.97 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Bartelkeite= 619.99 barns/electron
U=PE_Bartelkeite x rElectron Density=2,712.58 barns/cc.

Radioactivity:

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

Bartelkeite Classification

Dana Class:

07.06.02.01 (07)Multiple Oxides

(07.06)where A (B)4 X9

(07.06.02)Dana Group

07.06.02.01 Bartelkeite PbFeGe3O8 P 2₁,P 2₁/m Mono

Strunz Class:

09.JA.10 09 - SILICATES (Germanates)

09.J - Germanates

09.JA -Germanates

09.JA.10 Bartelkeite PbFeGe3O8 P 2₁,P 2₁/m Mono

Other Bartelkeite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Bartelkeite :
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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Bartelkeite

PbFe++Ge3O8
Dana No: 07.06.02.01 Strunz No: 09.JA.10
Locality:

Notes:

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