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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,Mn)
 
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.

Internet Links for Bartelkeite

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    Localities for Bartelkeite

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Namibia
     
    • Otjikoto (Oshikoto) Region
      • Tsumeb
    		Chemie der Erde,(1981) 40, 201-206
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 11th Nov 2009 03:42:27