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Dixenite (Dixenit)

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Dixenit
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Dixenit
radialstrahliges, braunes Aggregat von Dixenit, Långban, Värmland, Schweden; BB < 5 mm
Copyright: mintreasure.com; Contribution: openpit
Location: Schweden/Värmland, Provinz/Filipstad, Gemeinde/Långban, Distrikt
Mineral: Dixenite
Image: 1654108303
License: Usage for Mineralienatlas project only
Dixenit

radialstrahliges, braunes Aggregat von Dixenit, Långban, Värmland, Schweden; BB < 5 mm
Copyright: mintreasure.com
Contribution: openpit 2022-06-01
Locality: Långban, Distrikt / Filipstad, Gemeinde / Värmland, Provinz / Schweden

Collectors Summary

Color bronze, schwarz-met.
Hardness (Mohs) 3.00 - 4.00
Solubility +++ HCl
Crystal System trigonal, R3

Chemism

Chemical formula

Cu1+Mn142+Fe3+(As3+O3)5(SiO4)2(As5+O4)(OH)6

Chemical composition

Arsen, Eisen, Kupfer, Mangan, Silicium, Sauerstoff, Wasserstoff

Unit weight: 1928.2537426 u; Number of atoms in the formula: 63

Info

Empirical formula:

CuMn14Fe(AsO3)5(SiO4)2(AsO4)(OH)6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.31

6

9.52

1.0079470

6.0476820
Oxygen

O

27.38

33

52.38

15.9994300

527.9811900
Silicon

Si

2.91

2

3.17

28.0855300

56.1710600
Manganese

Mn

39.89

14

22.22

54.9380499

769.1326986
Iron

Fe

2.90

1

1.59

55.8452000

55.8452000
Copper

Cu

3.30

1

1.59

63.5463000

63.5463000
Arsenic

As

23.31

6

9.52

74.9216020

449.5296120

Strunz 9th edition incl. updates

8.BE.45

8: Phosphate, Arsenate, Vanadate
B: Phosphate, etc., mit weitere Anionen, ohne H2O
E: Mit ausschließlich mittelgroßen [Kationen] (OH, etc.):RO4 > 2:1
45:Hämatolith-Gruppe

Lapis Classification

VIII/B.11-010

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen

Classification by Hölzel

9.AJ.200

9: SILICATES
A: Nesosilicates
J: Nesosilicates with other complex Anions
2: With ~[AsO3],~[AsO4]

Dana 8th edition

46.02.08.01

46: Basic or Halogen-Containing Antimonites, Arsenites and Phosphites
02: Basic or Halogen-Containing Antimonites, Arsenites and Phosphites with miscellaneous formulae
08: Dixenite Group

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

bronze, schwarz-met.

RI value α / ω / n

1.96

2V angle

Uniaxial (+)

Crystallography

Crystal System

trigonal

Class (H-M)

3

Space Group number

146

Space Group

R3

Cell parameters a (Å)

8.2204(3)

Cell parameters b (Å)

-

Cell parameters c (Å)

37.485(3)

Cell parameters a/b or c/a

4.560

Cell parameters c/b

-

Z

3

Volumne (ų)

2193.684

Kristall structure

Frank C. Hawthorne; John M. Hughes: The suppression of lone-pair stereoactivity in [Cu+(As3+O3)4] clusters in dixenite: A tribute to Paul B. Moore. American Mineralogist Vol. 106, Nr. 10 (2021) S. 1580–1585.

Araki T, Moore P B: Dixenite, Cu1+Mn2+14Fe3+(OH)6(As3+O3)5(Si4+O4)2(As5+O4): metallic [As3+4Cu1+] clusters in an oxide matrix. American Mineralogist Vol. 66 (1981) S. 1263-1273.

X-Ray Powder Diffraction

4.10(90),
3.90(50),
2.96(80),
2.92(100),
2.83(50),
2.40(50),
2.37(80),
1.551(50)
XRD chart Dixenite

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)

3.00 - 4.00

VHN (Hardness Vickers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.36 (gemessen)

4.379 ( ρ calc. Mineralienatlas )

Instability

+++ HCl

(Co-)Type locality

(Co-)Type locality

Schweden/Värmland, Provinz/Filipstad, Gemeinde/Långban, Distrikt/Långban Fe-Mn-(Ba-As-Pb-Sb) Lagerstätte

Preface

Author (Name, Year)

Flink, 1920

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 193

Other languages

German

Dixenit

Spanish

Dixenita

English

Dixenite

French

Dixenite

Russian

Диксенит

Japanese

ﾃﾞｨｸｾﾅｲﾄ

CNMNC symbol

Symbol

Dxn

Locations with GPS information