Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Bartelkeite

This page is currently not sponsored. Click here to sponsor this page.
Formula:
PbFeGe(Ge2O7)(OH)2 · H2O
System:
Monoclinic
Colour:
Colourless, white to ...
Lustre:
Sub-Adamantine
Hardness:
4
Name:
For Wolfgang Bartelke, German mineral collector and specialist in the minerals of Tsumeb, Namibia.
Structurally related to the monoclinic non-quenchable high-pressure phase of lawsonite (lawsonite itself is orthorhombic).

Chemically related to mathewrogersite.


Classification of Bartelkeite

Approved
Approval Year:
1979
9.J0.10

9 : SILICATES (Germanates)
J : Germanates
0 :
7.6.2.1

7 : MULTIPLE OXIDES
6 : (AB)5X8
7.11.19

7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb

Physical Properties of Bartelkeite

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

Optical Data of Bartelkeite

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

IMA Formula:
PbFeGe(Ge2O7)(OH)2 · H2O
Elements listed in formula:
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.-%

Crystallography of Bartelkeite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Space Group Setting:
P1 21/m 1
Cell Parameters:
a = 5.8279(2) Å, b = 13.6150(4) Å, c = 6.3097(2) Å
β = 127.314(2)°
Ratio:
a:b:c = 0.428 : 1 : 0.463
Unit Cell Volume:
V 398.18 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals tabular on {10_1} or acicular on {101}; {111} and {010} also observed
Comment:
contains Ge in both octahedral coordination with Fe, and in tetrahedral coordination as sorogermanate anion [Ge2O7]
X-Ray Powder Diffraction Data:
d-spacingIntensity
2.91 (10)
4.42 (8)
2.87 (8)
2.75 (7)
2.20 (7)
4.74 (6)
5.08 (5)
Comments:
Recorded on type material

Type Occurrence of Bartelkeite

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
Empirical Formula:
Pb0.97Fe2+0.99Ge3.02O8
Associated Minerals at Type Locality:

Relationship of Bartelkeite to other Species

7.11.1RomarchiteSnO
7.11.2CassiteriteSnO2
7.11.4SchoenfliesiteMgSn(OH)6
7.11.5BurtiteCaSn4+(OH)6
7.11.6VismirnoviteZnSn(OH)6
7.11.7WickmaniteMn2+Sn4+(OH)6
7.11.8TetrawickmaniteMn2+Sn4+(OH)6
7.11.9Jeanbandyite(Fe3+,Mn2+)Sn4+(OH,O)6
7.11.10NataniteFe2+Sn4+(OH)6
7.11.11MushistoniteCu2+Sn4+(OH)6
7.11.12Ferronigerite-2N1S(Al,Fe,Zn)2(Al,Sn)6O11(OH)
7.11.13Magnesionigerite
7.11.14ArgutiteGeO2
7.11.15BrunogeieriteFe22+Ge4+O4
7.11.16StottiteFe2+Ge4+(OH)6
7.11.17CarboiriteFe2+Al2GeO5(OH)2
7.11.18OtjisumeitePbGe4O9
7.11.20MassicotPbO
7.11.21LithargePbO
7.11.22MiniumPb22+Pb4+O4
7.11.23PlattneritePbO2
7.11.24ScrutinyitePbO2
7.11.25MurdochiteCu12Pb2O15Cl2
7.11.26MacedonitePbTiO3
7.11.27CesàrolitePbMn34+O6(OH)2
7.11.28CoronaditePb(Mn64+Mn23+)O16
7.11.29QuenselitePbMn3+O2(OH)
7.11.30PlumboferritePb2(Fe3+,Mn2+,Mg)11O19
7.11.31MagnetoplumbitePbFe123+O19
7.11.32SenaitePb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38

Other Names for Bartelkeite

Name in Other Languages:
German:Bartelkeit
Spanish:Bartelkeita

Other Information

Health Risks:
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). [Abs. in American Mineralogist (1982), 67, 413].

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

Origlieri, M.J., Yang, H., Downs, R.T., Posner, E.S., Domanik, K.J. and Pinch, W.W. (2012) The crystal structure of bartelkeite, with a revised chemical formula PbFeGeVI(GeIV2O7)(OH)2.H2O, isotypic with high-pressure P21/m lawsonite. American Mineralogist 97, 1812-1815.

Internet Links for Bartelkeite

mindat.org URL:
https://www.mindat.org/min-541.html
Please feel free to link to this page.

Localities for Bartelkeite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (TL)
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Chemie der Erde,(1981) 40, 201-206
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2017, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: April 29, 2017 14:18:45 Page generated: April 27, 2017 03:09:11
Go to top of page