Magnussonite Mineral Data

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General Magnussonite Information

Chemical Formula:

Mn++5As+++3O9(OH,Cl)

Composition:

Molecular Weight = 665.07 gm

Manganese 41.30 % Mn 53.33 % MnO

Arsenic 33.80 % As 44.62 % As₂O₃

Hydrogen 0.11 % H 1.02 % H₂O

Chlorine 1.33 % Cl 1.33 % Cl

- % Cl -0.30 % -O=Cl₂

Oxygen 23.46 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₅As₃O₉(OH)_0.75Cl_0.25

Environment:

In a metamorphosed Fe-Mn orebody.

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

Langban, Varmland, and in the Brattfors mine, Nordmark, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for Nils Harald Magnusson (1890-1976), formerly Director, Geological Survey of Sweden, for his contributions to knowledge of the Langban mine.

Name Pronunciation:

Magnussonite + Pronunciation

Synonym:

ICSD 100494

PDF 10-407

Magnussonite Image

Images:

Magnussonite

Comments: Bright green crystalline magnussonite grains with willemite.
Location: Sterling Mine, Ogdensburg, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Magnussonite Crystallography

Cell Dimensions:

a = 16.05, Z = 16; V = 4,134.52 Den(Calc)= 4.27

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I a3d

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

By Intensity(I/I_o): 2.85(1), 2.47(0.3), 3.12(0.3),

Crystal Structure:

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Moore P B , Araki T , American Mineralogist , 64 (1979) p.390-401, Magnussonite, manganese arsenite, a fluorite derivative structure

Physical Properties of Magnussonite

Color:

Blue green, Grass green, Dark red.

Density:

4.3

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Magnussonite

Gladstone-Dale:

CI meas= -0.047 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2295,KPDmeas= 0.2279,KC= 0.2176
Ncalc = 1.93 - 1.94

Optical Data:

Isotropic, n=1.98.

Calculated Properties of Magnussonite

Electron Density:

Bulk Density (Electron Density)=3.97 gm/cc
note: Specific Gravity of Magnussonite =4.30 gm/cc.

Fermion Index:

Fermion Index = 0.0001127562
Boson Index = 0.9998872438

Photoelectric:

PE_Magnussonite= 34.79 barns/electron
U=PE_Magnussonite x rElectron Density= 138.10 barns/cc.

Radioactivity:

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

Magnussonite Classification

Dana Class:

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

(46.01)where (A B)m (XO3)p Zq

(46.01.03)Dana Group

46.01.03.01 Magnussonite Mn5As3O9(OH,Cl) I a3d 4/m 3 2/m

Strunz Class:

04.JB.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.J - Arsenites, Antimonites, Bismuthites, Sulfites,

04.JB -Arsenites, antimonites, bismuthites; with additional anions, without H2O

04.JB.15 Magnussonite Mn5As3O9(OH,Cl) I a3d 4/m 3 2/m

Other Magnussonite Information

References:

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

See Also:

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

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Ask about Magnussonite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Print or Cut-and-Paste your Magnussonite Specimen Label here :

Magnussonite

Mn++5As+++3O9(OH,Cl)
Dana No: 46.01.03.01 Strunz No: 04.JB.15
Locality:

Notes: