Dixenite Mineral Data

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General Dixenite Information

Chemical Formula:

Cu+Mn++14Fe+++(As+++O3)5(SiO4)2(As+++++O4)(OH)6

Composition:

Molecular Weight = 1,928.25 gm

Manganese 39.89 % Mn 51.50 % MnO

Iron 2.90 % Fe 4.14 % Fe₂O₃

Copper 3.30 % Cu 3.71 % Cu₂O

Silicon 2.91 % Si 6.23 % SiO₂

Arsenic 23.31 % As 25.65 % As₂O₃ / 5.96 % As₂O₅

Hydrogen 0.31 % H 2.80 % H₂O

Oxygen 27.38 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CuMn²⁺₁₄Fe³⁺(AsO₃)₅(SiO₄)₂(AsO₄)(OH)₆

Environment:

In a metamorphosed Fe-Mn orebody in serpentine.

IMA Status:

Valid Species (Pre-IMA) 1920

Locality:

Langbanshyttan, Vermland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek di, for two, and xenos, for stranger, in reference to the then unique association of silica and arsenious oxide in the mineral.

Name Pronunciation:

Dixenite

Synonym:

ICSD 30787

PDF 35-520

Dixenite Image

Images:

Dixenite

Comments: Deep red translucent crystalline grains of dixenite.
Location: Langban, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dixenite Crystallography

Axial Ratios:

a:c = 1:4.55362

Cell Dimensions:

a = 8.233, c = 37.49, Z = 3; V = 2,200.71 Den(Calc)= 4.36

Crystal System:

Trigonal - PyramidalH-M Symbol (3) Space Group: R 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.927(1), 3.435(0.44), 2.965(0.36),

Crystal Structure:

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Araki T , Moore P B , American Mineralogist , 66 (1981) p.1263-1273, Dixenite, CuMn14Fe(OH)6(AsO3)5(SiO4)2(AsO4): Metallic [As4Cu] clusters, in an oxide matrix

Physical Properties of Dixenite

Cleavage:

{001} Perfect

Color:

Bronze, Black.

Density:

4.2

Diaphaneity:

Translucent to subtranslucent to opaque

Habit:

Foliated - Two dimensional platy forms.

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Optical Properties of Dixenite

Gladstone-Dale:

CI meas= 0.061 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.096 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.195,KPDmeas= 0.2024,KC= 0.2156
Ncalc = 1.91 - 1.94

Optical Data:

Uniaxial (-), e=1.73, w=1.97, bire=0.2400.

Calculated Properties of Dixenite

Electron Density:

Bulk Density (Electron Density)=3.93 gm/cc
note: Specific Gravity of Dixenite =4.20 gm/cc.

Fermion Index:

Fermion Index = 0.002106299
Boson Index = 0.997893701

Photoelectric:

PE_Dixenite= 29.17 barns/electron
U=PE_Dixenite x rElectron Density= 114.48 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dixenite is Not Radioactive

Dixenite Classification

Dana Class:

46.02.08.01 (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites

(46.02)with miscellaneous formulae

(46.02.08)Dixenite Group

46.02.08.01 Dixenite CuMn14Fe(AsO3)5(SiO4)2(AsO4)(OH)6 R 3 3

46.02.08.02 Arakiite! (Zn,Mn)(Mn,Mg)12(Fe,Al)2(AsO3)(AsO4)2(OH)23 Cc m

Strunz Class:

08.BE.45 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BE -With only medium-sized cations, (OH, etc.):RO4 > 2:1

08.BE.45 Dixenite CuMn14Fe(AsO3)5(SiO4)2(AsO4)(OH)6 R 3 3

08.BE.45 Hematolite (Mn,Mg,Al)15(AsO3)(AsO4)2(OH)23 R 3 3

08.BE.45 Kraisslite (Mn,Mg)24Zn3Fe(AsO3)2(AsO4)3(SiO4)6(OH)18 P 6₃22 6 2 2

08.BE.45 Mcgovernite Mn9Mg4Zn2As2Si2O17(OH)14 R 3c 3 2/m

08.BE.45 Turtmannite! (Mn,Mg)25.5[(V,As)O4]3(SiO4)3[AsO3]xO5-5x(OH)20x R 3c 3 2/m

08.BE.45 Arakiite! (Zn,Mn)(Mn,Mg)12(Fe,Al)2(AsO3)(AsO4)2(OH)23 Cc m

Other Dixenite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Dixenite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Dixenite Specimen Label here :

Dixenite

Cu+Mn++14Fe+++(As+++O3)5(SiO4)2(As+++++O4)(OH)6
Dana No: 46.02.08.01 Strunz No: 08.BE.45
Locality:

Notes: