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Bartelkeite

Pictures (2 Images total)

Bartelkeit
Views (File:
1584550681
): 623
Bartelkeit
olivgrünes Aggregat von Bartelkeit neben Nadeln von Schaurtit oder Fleischerit (analysiert mittels S-XRD), Tsumeb, Namibia; BB
Copyright: Joy Desor; Contribution: openpit
Location: Namibia/Oshikoto (Otjikoto), Region/Tsumeb
Mineral: Bartelkeite
Image: 1584550681
License: Usage for Mineralienatlas project only
Bartelkeit

olivgrünes Aggregat von Bartelkeit neben Nadeln von Schaurtit oder Fleischerit (analysiert mittels S-XRD), Tsumeb, Namibia; BB

Copyright: Joy Desor
Contribution: openpit 2020-03-18
Locality: Tsumeb / Oshikoto (Otjikoto), Region / Namibia
Bartelkeit
Views (File:
1680817556
): 73
Bartelkeit
braungelbe, prismatische Kristalle von Bartelkeit, Tsumeb Mine, Tsumeb, Namibia; BB ~ 2 mm, analysiert mittels REM-EDX
Copyright: Joy Desor; Contribution: openpit
Location: Namibia/Oshikoto (Otjikoto), Region/Tsumeb/Tsumeb Mine
Mineral: Bartelkeite
Image: 1680817556
License: Usage for Mineralienatlas project only
Bartelkeit  E
Analysed with energy dispersive X-ray spectroscopy EDX

braungelbe, prismatische Kristalle von Bartelkeit, Tsumeb Mine, Tsumeb, Namibia; BB 2 mm, analysiert mittels REM-EDX

Copyright: Joy Desor
Contribution: openpit 2023-04-06
Locality: Tsumeb Mine / Tsumeb / Oshikoto (Otjikoto), Region / Namibia

Collectors Summary

Color farblos, hellgrün
Streak color weiß
Hardness (Mohs) 4
Cleavages {101} deutlich
Solubility +++ heiße HCl
Crystal System monoklin, P21, P21/m

Additional information / Summary

Germanium besitzt in Bartelkeit zwei verschiedene Koordinationen: PbFe2+GeVI(GeIV2O7)(OH)2·H2O

Chemism

Chemical formula

PbFe2+Ge(Ge2O7)(OH)2·H2O

Additional chem. information

isotypisch mit der Hochdruckversion P21/m von Lawsonit

Chemical composition

Blei, Eisen, Germanium, Sauerstoff, Wasserstoff

Unit weight: 645.004288 u; Number of atoms in the formula: 19

Info

Empirical formula:

PbFeGe(Ge2O7)(OH)2·H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.63

4

21.05

1.0079470

4.0317880

Oxygen

O

24.81

10

52.63

15.9994300

159.9943000

Iron

Fe

8.66

1

5.26

55.8452000

55.8452000

Germanium

Ge

33.79

3

15.79

72.6410000

217.9230000

Lead

Pb

32.13

1

5.26

207.2100000

207.2100000

Analysis wt%

GeO2 : 53.70, PbO : 34.00, FeO : 12.10 (Ref: Chemie der Erde 81)

Strunz 9th edition incl. updates

9.JA.10

9: Silikate (Germanate)
J: Germanate
A:
10:Bartelkeit-Gruppe

Lapis Classification

IV/C.08-060

IV: OXIDE
C: Oxide mit Verhältnis Metall : Sauerstoff = 2:3 (M2O3 und verwandte Verbindungen)
8: Magnetoplumbit- Gruppe

Classification by Hölzel

4.BE.360

4: OXIDES
B: Spinels R3O4
E: Mn-Spinels

Dana 8th edition

07.06.02.01

07: Multiple Oxides
06: Multiple Oxides where A (B)4 X9

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, hellgrün

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.028

Birefringence chart\! Bartelkeite title=Birefringence chart Bartelkeite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.885

RI value β

1.910

RI value γ / ε

1.913

Ri mean

1.903

2V angle

Biaxial (-) 35°

Crystallography

Crystal System

monoklin

Class (H-M)

2, 2/m

Space Group number

4, 11

Space Group

P21, P21/m

Cell parameters a (Å)

5.431

Cell parameters b (Å)

13.689

Cell parameters c (Å)

5.892

Cell parameters a/b or c/a

0.397

Cell parameters c/b

0.430

Cell parameters α

90°

Cell parameters β

111.78

Cell parameters γ

90°

Z

2

Volume (ų)

406.771

X-Ray Powder Diffraction

5.08(50),
4.74(60),
4.42(80),
3.50(50),
2.91(100),
2.87(80),
2.75(70),
2.20(70)

XRD chart Bartelkeite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4

Density (g/cm³)

4.97

5.266 ( ρ calc. Mineralienatlas )

Cleavages

{101} deutlich

Instability

+++ heiße HCl

(Co-)Type locality

(Co-)Type locality

Namibia/Oshikoto (Otjikoto), Region/Tsumeb/Tsumeb Mine

Type material

Archiv der Universität Stuttgart, "Mineralogische Sammlung Prof. Keller"

Collection number of type material

TM-79.29-Tn / 0/824-s27/2

Paragenesis of type material

Germanit, Renierit, Tennantit, Bleiglanz, Chalkosin, Quarz, Wulfenit

Preface

Author (Name, Year)

Keller & Hess & Dunn, 1981

References

Chemie der Erde 40 (1981), 201

Origlieri, M.J., Yang, H., Downs, R.T., Posner, E.S., Domanik, K.J., 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. - [Neue Formel]

Other languages

German

Bartelkeit

English

Bartelkeite

French

Bartelkeite

Spanish

Bartelkeíta

Russian

Бартелкеит

CNMNC (IMA)-Number

IMA 1979-029

CNMNC symbol

Symbol

Btk

Locations with GPS information

IDs

GUSID (Global unique identifier short form) j0Negjure0Wx2AMhbacyXA
GUID (Global unique identifier) 825E438F-AB3B-457B-B1D8-03216DA7325C
Database ID 305