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Bartelkeite

Formula:
PbFe
2+
 
Ge
 
3
O
 
8
System:MonoclinicColour:Colourless, white to ...
Hardness:4
Name:For Wolfgang Bartelke, German mineral collector and specialist in the minerals of Tsumeb, Namibia.
This page provides mineralogical data about Bartelkeite.

Classification of Bartelkeite

IMA status:Approved 1979
Strunz 8th edition ID:4/C.08-60
Nickel-Strunz 10th (pending) edition ID:9.JA.10

9 : SILICATES (Germanates)
J : Germanates
A :
Dana 8th edition ID:7.6.2.1

7 : MULTIPLE OXIDES
6 : (AB)5X8
Hey's CIM Ref.:7.11.19

7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb
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Type Occurrence of Bartelkeite

Type Locality:Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
General Appearance of Type Material:Tabular and acicular crystals to 1 mm
Place of Conservation of Type Material:University of Stuttgart, Stuttgart, Germany (No. NM07);
National Museum of Natural History, Washington, D.C., USA (No. 148302)
Geological Setting of type material:In cavities in oxidized primary germanium ore from a dolostone-hosted hydrothermal polymetallic ore deposit
Associated Minerals at type locality:
TennantiteRenieriteGermaniteGalena

Physical Properties of Bartelkeite

Lustre:Sub-Adamantine
Diaphaneity (Transparency):Transparent
Colour:Colourless, white to very pale greenish
Streak:White
Hardness (Mohs):4
Cleavage:Distinct/Good
on {101}
Density (calculated):4.97 g/cm3

Crystallography of Bartelkeite

Crystal System:Monoclinic
Cell Parameters:a = 5.431Å, b = 13.689Å, c = 5.892Å
β = 111.79°
Ratio:a:b:c = 0.397 : 1 : 0.43
Unit Cell Volume:V 406.74 ų (Calculated from Unit Cell)
Z:2
Morphology:Crystals tabular on {10_1} or acicular on {101}; {111} and {010} also observed
X-Ray Powder Diffraction:
d-spacingIntensity
2.91 (10)
4.42 (8)
2.87 (8)
2.75 (7)
2.20 (7)
4.74 (6)
Comments:Recorded on type material

Optical Data of Bartelkeite

Type:Biaxial (-)
RI values: nα = 1.885 nβ = 1.910 nγ = 1.913
2V:Measured: 35°
Maximum Birefringence:δ = 0.028

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r < v

Chemical Properties of Bartelkeite

Formula:
PbFe
2+
 
Ge
 
3
O
 
8
Essential elements:Fe, Ge, O, Pb
All elements listed in formula:Fe, Ge, O, Pb
Analytical Data:Electron microprobe analysis of type material; valency of iron determined microchemically
GeO2 (53.7)
FeO (12.1)
PbO (34.0)

sum 99.8 wt.-%
Empirical Formula:
Pb
 
0.97
Fe
2+
0.99
Ge
 
3.02
O
 
8

Relationship of Bartelkeite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.JA.05Carboirite
FeAl
 
2
GeO
 
5
(OH)
 
2
9.JA.15Otjisumeite
PbGe
 
4
O
 
9
Related Minerals - Hey's Index Grouping:

- +
7.11.1Romarchite
SnO
7.11.2Cassiterite
SnO
 
2
7.11.4Schoenfliesite
Mg[Sn(OH)
 
6
]
7.11.5Burtite
Ca[Sn(OH)
 
6
]
7.11.6Vismirnovite
Zn[Sn(OH)
 
6
]
7.11.7Wickmanite
Mn
2+
 
[Sn(OH)
 
6
]
7.11.8Tetrawickmanite
Mn
2+
 
[Sn
4+
 
(OH)
 
6
]
7.11.9Jeanbandyite
(Fe
2+
 
,Mn
2+
 
)[Sn
4+
 
(OH)
 
6
]
7.11.10Natanite
Fe
2+
 
[Sn(OH)
 
6
]
7.11.11Mushistonite
(Cu,Zn,Fe
2+
 
)[Sn(OH)
 
6
]
7.11.12Ferronigerite-2N1S
Sn(Fe,Mg)Al
 
6
O
 
11
(OH)
7.11.13Magnesionigerite
7.11.14Argutite
GeO
 
2
7.11.15Brunogeierite
(Ge,Fe)Fe
 
2
O
 
4
7.11.16Stottite
Fe
2+
 
[Ge
4+
 
(OH)
 
6
]
7.11.17Carboirite
FeAl
 
2
GeO
 
5
(OH)
 
2
7.11.18Otjisumeite
PbGe
 
4
O
 
9
7.11.20Massicot
PbO
7.11.21Litharge
PbO
7.11.22Minium
Pb
 
3
O
 
4
7.11.23Plattnerite
PbO
 
2
7.11.24Scrutinyite
alpha-PbO
 
2
7.11.25Murdochite
PbCu
 
6
O
 
8-x
(Cl,Br)
 
2x
 x<=0.5
7.11.26Macedonite
PbTiO
 
3
7.11.27Cesàrolite
PbH
 
2
Mn
 
3
O
 
8
7.11.28Coronadite
Pb(Mn
4+
 
,Mn
3+
 
)
 
8
O
 
16
7.11.29Quenselite
PbMnO
 
2
(OH)
7.11.30Plumboferrite
Pb
 
2
Fe
3+
11-x
Mn
2+
x
O
 
19-2x
, x = 1/3
7.11.31Magnetoplumbite
(Pb,Mn)(Fe,Mn)
 
12
O
 
19
7.11.32Senaite
Pb(Ti,Fe,Mn)
 
21
O
 
38

Other Names for Bartelkeite

Synonyms:
IMA1979-029
Other Languages:
German:Bartelkeit
Spanish:Bartelkeita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Bartelkeite

Reference List:Keller, P., Hess, H. and Dunn, P. J. (1981): Bartelkeit, PbFe2+Ge3O8, ein neues Germanium-Mineral von Tsumeb, Namibia. Chemie der Erde 40, 201-206 (in German with English abstract). - American Mineralogist (1982), 67, 413 (abstract).

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 45.

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    Localities for Bartelkeite

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