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Alumotungstite (Alumotungstit)

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Alumotungstit
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Alumotungstit
Alumotungstit auf Wolframit, Bildbreite: 2 mm, Fundort: Hemerdon Ball, Plympton, Devon Co., England, UK
Copyright: Richard De Nul; Contribution: thdun5
Location: UK/England/Devon Co./Plymouth/Plympton/Hemerdon Mine (Hemerdon Bal Mine)
Mineral: Alumotungstite
Image: 1295116657
License: Usage for Mineralienatlas project only
Alumotungstit

Alumotungstit auf Wolframit, Bildbreite: 2 mm, Fundort: Hemerdon Ball, Plympton, Devon Co., England, UK
Copyright: Richard De Nul
Contribution: thdun5 2011-01-15
Locality: Hemerdon Mine (Hemerdon Bal Mine) / Plympton / Plymouth / Devon Co. / England / UK

Collectors Summary

Color grünlichgelb
Streak color gelb
Crystal System kubisch,

Additional information / Summary

kein anerkanntes Mineral; Al-(Aluminium)-haltige Varietät mit W>Al von Hydrokenoelsmoreit

Chemism

Chemical formula

(H2O,Ca)x(W,Al)2(O,OH)6·nH2O

Chemical composition

Aluminium, Calcium, Sauerstoff, Wasserstoff, Wolfram

Analysis wt%

Al2O3 : 9.41, WO3 : 85.60, H2O : 4.99 (Ref: berechnet)

Strunz 9th edition incl. updates

4.DH.15

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
H: Mit großen (± mittelgroßen) [Kationen]; Lagen kantenverknüpfter Oktaeder
15:Pyrochlor-Gruppe

Classification by Hölzel

4.CL.961

4: OXIDES
C: R2O3 Sesquioxides
L: Elsmoreite-Group, W-dominant on the B-site

Dana 8th edition

04.05.04.01

04: Oxide Minerals
05: Simple Oxides with a cation charge of 6+ (A++++++ O3)

IMA status

Als Mineral aberkannt 2010, The Pyrochlore Supergroup of Minerals: Nomenclature; The Canadian Mineralogist Vol. 48, pp. 673-698 (2010)

Mineral status

Varietät

Variety / polytype of

Hydrokenoelsmoreite

Optical Properties

Color

grünlichgelb

Streak color

gelb

Diaphaneity (Transparency)

durchscheinend

RI value α / ω / n

1.90

Ri mean

1.9

2V angle

Isotropisch

Crystallography

Crystal System

kubisch

Cell parameters a (Å)

10.199

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

1

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volumne (ų)

1060.896

X-Ray Powder Diffraction

5.81(80),
3.06(100),
2.93(80),
1.798(60),
1.536(60)
XRD chart Alumotungstite

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

Crystals 3D

Open larger view

Physical Properties

Density (g/cm³)

4.52 (berechnet)

(Co-)Type locality

(Co-)Type locality

Malaysia/Perak/Kinta Valley/Zinnseifen

Preface

Author (Name, Year)

Sahama, 1981

References

Mineralogical Record 12 (1981), 81

The Pyrochlore Supergroup of Minerals: Nomenclature; The Canadian Mineralogist Vol. 48, pp. 673-698 (2010)

Other languages

German

Alumotungstit

Spanish

Alumotungstita

French

Alumotungstite

English

Alumotungstite

CNMNC (IMA)-Number

IMA 1968-004

Locations with GPS information