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Krieselite

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Krieselit
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Krieselit  E
Analysed with energy dispersive X-ray spectroscopy EDX

schmutzigweiße Aggregate von F-reichem Krieselit auf schwarzem Trägermaterial, Tsumeb Mine, Otavibergland, Namibia; BB 1 mm, analysiert mittels REM-EDX

Copyright: Joy Desor
Contribution: openpit 2020-05-08
Locality: Tsumeb Mine / Tsumeb / Oshikoto (Otjikoto), Region / Namibia

Collectors Summary

Color beige bis weiß
Lustre Fettglanz
Crystal System orthorhombisch, Pnma

Chemism

Chem­ical formula

(Al,Ga)2(Ge,C)O4(OH)2

Addi­tional chem. informa­tion

isotopisch mit Topas, Ge Analog von Topas

Chem­ical com­po­si­tion

Aluminium, Gallium, Germanium, Kohlenstoff, Sauerstoff, Wasserstoff

Unit weight: 230.8297763 u; Number of atoms in the formula: 11

Info

Empirical formula:

(Al0.75Ga0.25)2(Ge0.75C0.25)O4(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.87

2

18.18

1.0079470

2.0158940

Carbon

C

1.30

0.25

2.27

12.0107800

3.0026950

Oxygen

O

41.59

6

54.55

15.9994300

95.9965800

Aluminium

Al

17.53

1.5

13.64

26.9815382

40.4723073

Gallium

Ga

15.10

0.5

4.55

69.7231000

34.8615500

Germanium

Ge

23.60

0.75

6.82

72.6410000

54.4807500

Anal­y­sis wt%

GeO2 : 38.32, As2O3 : 1.54, Al2O3 : 44.34, Ga2O3 : 4.14, Fe2O3 : 0.43, ZnO : 0.70, F : 9.10, H2O : 3.51 (Ref: Neues Jahrbuch für Mineralogie, (Monatshefte) A2010)

Strunz 9th edi­tion incl. updates

9.

9: Silikate (Germanate)

Lapis Clas­sifica­tion

IV/C.22-005

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

Clas­sifica­tion by Hölzel

9.AI.145

9: SILICATES
A: Nesosilicates
I: Nesosilicates with OH
1: C small; Beryllite-Euclase-Topaz-Group

IMA sta­tus

anerkannt 2003

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

beige bis weiß

Diaphane­ity (Trans­parency)

durchscheinend

Lus­tre

Fettglanz

RI value α / ω / n

1.74

Ri mean

1.740

2V angle

Biaxial

Crystallography

Crystal Sys­tem

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pnma

Cell param­e­ters a (Å)

4.809

Cell param­e­ters b (Å)

9.111

Cell param­e­ters c (Å)

8.536

Cell param­e­ters a/b or c/a

0.528

Cell param­e­ters c/b

0.937

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

374.003

X-Ray Pow­der Diffrac­tion

3.811(78), 3.315(48), 3.016(100), 2.464(24), 2.417(27), 2.247(38), 1.398(29)

XRD chart Krieselite

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

Crystal Structure 3D

Open larger view

Physical Properties

VHN (Hard­ness Vick­ers)

520 (75g)

Density (g/cm³)

4.07 (berechnet)

4.099 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

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

References

Wunder, B. & Marler, B. - Ge-analogues of aluminium silicates: High-pressure synthesis and properties of Ge-topaz, Al2GeO4(OH)2. European Journal of Mineralogy 9 (1997), 1147-1158.

Marler, B. & Wunder, B. - Crystal structure of dialuminium dihydroxogermanate, Al2GeO4(OH)2. Zeitschrift für Kristallographie - New Crystal Structures 213 (1998), 3.

Schlüter J, Geisler T, Pohl D, Stephan T (2010) Krieselite, Al2GeO4(F,OH)2: A new mineral from the Tsumeb mine, Namibia, representing the Ge analogue of topaz, Neues Jahrbuch für Mineralogie, Abhandlungen 187, 33-40

Other languages

German

Krieselit

English

Krieselite

CNMNC (IMA)-Number

IMA 2000-043a

CNMNC symbol

Symbol

Kes

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Krieselit
Google-Bilder-Suche - search for: Krieselit
Mineralienatlas.de (Forum) - search for: Krieselit

English pages

Mindat - search for: Krieselite
Webmineral - search for:Krieselite
Handbook-of-Mineralogy - search for: Krieselite
RRUFF - Raman, XRD and other mineral data - search for: Krieselite
RRUFF - References and PDF downloads - search for: Krieselite
American-Mineralogist-Crystal-Structure-Database - search for: Krieselite
Strahlen.org - search for: Krieselite

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Krieselit
Crystal-Treasure.com - search for: Krieselit
Bosse - search for: Krieselit
Edelsteine Neuburg - Gundolf Fischer - search for: Krieselit

Locations with GPS information