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Bartelkeite

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Formula:
Pb(Fe2+Ge)[Ge2O7](OH)2 · H2O
Colour:
Colourless, white to very pale greenish
Lustre:
Sub-Adamantine
Hardness:
4
Specific Gravity:
4.97 (Calculated)
Crystal System:
Monoclinic
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.


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Classification of BartelkeiteHide

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 BartelkeiteHide

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

Optical Data of BartelkeiteHide

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 BartelkeiteHide

Formula:
Pb(Fe2+Ge)[Ge2O7](OH)2 · H2O
IMA Formula:
PbFeGe(Ge2O7)(OH)2 · H2O

Crystallography of BartelkeiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
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 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 DiffractionHide

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 BartelkeiteHide

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:

Synonyms of BartelkeiteHide

Other Language Names for BartelkeiteHide

German:Bartelkeit
Spanish:Bartelkeita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Siderite1 photo of Bartelkeite associated with Siderite on mindat.org.
Chalcocite1 photo of Bartelkeite associated with Chalcocite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.J0.05CarboiriteFeAl2(GeO4)O(OH)2Tric.
9.J0.15OtjisumeitePbGe4O9Tric.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.11.1RomarchiteSnOTet.
7.11.2CassiteriteSnO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
7.11.4SchoenfliesiteMg[Sn(OH)6]Iso. m3 (2/m 3) : Pn3
7.11.5BurtiteCa[Sn(OH)6]Iso.
7.11.6VismirnoviteZn[Sn(OH)6]Iso.
7.11.7WickmaniteMn2+[Sn(OH)6]Iso. m3 (2/m 3) : Pn3
7.11.8TetrawickmaniteMn2+[Sn4+(OH)6]Tet. 4/m : P42/n
7.11.9JeanbandyiteFe3+xFe2+1-xSn(OH)6-xOx (1 ≥ x > 0.5)Tet. 4/m : P42/n
7.11.10NataniteFe2+[Sn(OH)6]Iso. m3m (4/m 3 2/m) : Pn3m
7.11.11Mushistonite(Cu,Zn,Fe2+)[Sn(OH)6]
7.11.12Ferronigerite-2N1S(Al,Fe,Zn)2(Al,Sn)6O11(OH)Trig. 3m (3 2/m) : P3m1
7.11.13MagnesionigeriteTrig.
7.11.14ArgutiteGeO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
7.11.15BrunogeieriteFe2+2Ge4+O4Iso. m3m (4/m 3 2/m) : Fd3m
7.11.16StottiteFe2+[Ge4+(OH)6]Tet.
7.11.17CarboiriteFeAl2(GeO4)O(OH)2Tric.
7.11.18OtjisumeitePbGe4O9Tric.
7.11.20MassicotPbOOrth. mmm (2/m 2/m 2/m) : Cmmm
7.11.21LithargePbOTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
7.11.22MiniumPb3O4Tet. 4/mmm (4/m 2/m 2/m) : P42/mbc
7.11.23PlattneritePbO2Tet. 4/mmm (4/m 2/m 2/m)
7.11.24Scrutinyiteα-PbO2Orth.
7.11.25MurdochitePbCu6O8-x(Cl,Br)2x where x<=0.5Iso. m3m (4/m 3 2/m) : Fm3m
7.11.26MacedonitePbTiO3Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
7.11.27CesàrolitePb(Mn4+)3O6(OH)2
7.11.28CoronaditePb(Mn4+6Mn3+2)O16Mon. 2/m
7.11.29QuenselitePbMnO2(OH)Mon. 2/m : P2/b
7.11.30PlumboferritePb2(Fe3+,Mn2+,Mg)11O19Trig. 3 2
7.11.31Magnetoplumbite(Pb,Mn)(Fe,Mn)12O19Hex.
7.11.32SenaitePb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38Trig.

Other InformationHide

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 BartelkeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 BartelkeiteHide

Localities for BartelkeiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Namibia (TL)
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Chemie der Erde,(1981) 40, 201-206
Mineral and/or Locality  
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