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Gallobeudantite (Gallobeudantit)

Collectors Summary

Color blass gelb, grünlichgelb, cremfarben
Streak color blass gelblich weiß
Lustre Glasglanz
Hardness (Mohs) 4
Cleavages {001} möglicherweise
Fracture eben bis muschelig
Crystal System trigonal, R3m

Chemism

Chemical formula

PbGa3(AsO4)(SO4)(OH)6

Chemical composition

Arsen, Blei, Gallium, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 753.406104 u; Number of atoms in the formula: 26

Info

Empirical formula:

PbGa3(AsO4)(SO4)(OH)6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.80

6

23.08

1.0079470

6.0476820
Oxygen

O

29.73

14

53.85

15.9994300

223.9920200
Sulfur

S

4.26

1

3.85

32.0655000

32.0655000
Gallium

Ga

27.76

3

11.54

69.7231000

209.1693000
Arsenic

As

9.94

1

3.85

74.9216020

74.9216020
Lead

Pb

27.50

1

3.85

207.2100000

207.2100000

Analysis wt%

PbO : 30.40, ZnO : 0.50, Ga2O3 : 19.80, Fe2O3 : 10.70, Al2O3 : 3.00, As2O5 : 20.20, SO3 : 8.20, H2O : 6.90 (Ref: Canadian Mineralogist 96)

Strunz 9th edition incl. updates

8.BL.05

8: Phosphate, Arsenate, Vanadate
B: Phosphate, etc., mit weitere Anionen, ohne H2O
L: Mit mittelgroßen und großen [Kationen] (OH, etc.):RO4 = 3:1
05:Beudantit-Gruppe

Lapis Classification

VII/B.35-075

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
B: Wasserfreie Phosphate, mit fremden Anionen F,Cl,O,OH
35: Mittelgroße und große Kationen: Mg-Cu-Zn und Ca-Na-K-Ba-Pb; Beudantit-Gruppe

Classification by Hölzel

7.BC.300

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
B: Sulfates (+Anions -Water)
C: Beudantite-Group
3: Beudantites with other elements than Al, Fe(3+)

Dana 8th edition

43.04.01.10

43: Compound Phosphates, etc.
04: Compound Phosphates, etc. (Anhydrous Compound Anions With Hydroxyl or Halogen)
01: Beudantite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Alunite supergroup  ⇒ Beudantite group with 1c

Optical Properties

Color

blass gelb, grünlichgelb, cremfarben

Streak color

blass gelblich weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.013
Birefringence chart\! Gallobeudantite title=Birefringence chart Gallobeudantite

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

1.763

RI value γ / ε

1.750

Ri mean

1.759

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

160

Space Group

R3m

Cell parameters a (Å)

7.225

Cell parameters b (Å)

-

Cell parameters c (Å)

17.03

Cell parameters a/b or c/a

2.357

Cell parameters c/b

-

Z

3

Volumne (ų)

769.876

X-Ray Powder Diffraction

5.85(90),
3.59(40),
3.038(100),
2.851(30),
2.513(30),
2.271(40),
1.948(30),
1.797(30)
XRD chart Gallobeudantite

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

VHN (Hardness Vickers)

190 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.87 (berechnet)

4.875 ( ρ calc. Mineralienatlas )

Cleavages

{001} möglicherweise

Fracture

eben bis muschelig

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

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

Type material

Canadian Museum of Nature, Ottawa, Kanada

Canadian Geological Survey, Ottawa, Kanada

Collection number of type material

81518 (Canadian Museum of Nature)

Preface

Name from

Für sein vorherrschendes Galliumgehalt als Mitglied der Gruppe Beudantit.

Author (Name, Year)

Jambor & Owens & Grice & Feinglos, 1996

References

Canadian Mineralogist 34 (1996), 1305

IMA group assignments

Other languages

German

Gallobeudantit

English

Gallobeudantite

French

Gallobeudantite

Spanish

Galobeudantita

Russian

Галлобёдантит

Alternative Name

Gallobeudantita

CNMNC (IMA)-Number

IMA 1994-021

CNMNC symbol

Symbol

Gbdn

Locations with GPS information