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Magnussonite

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About MagnussoniteHide

03139200014946650198637.jpg
Nils H. Magnusson
Formula:
Mn10As6O18(OH,Cl)2
initial (Moore & Araki, 1979) structural formula: Mn2+18[As3+6Mn+O18]2Cl2 but it is not necessarily confirmed (or disproved) by further studies
Colour:
Emerald- or grass-green; bluish green; pale green, olive-green. greenish-tan
Lustre:
Sub-Vitreous, Resinous, Greasy
Hardness:
3½ - 4
Specific Gravity:
4.14 - 4.49
Crystal System:
Isometric
Name:
Named in 1956 by Olof Erik Gabrielson in honor of Professor Nils Harald Magnusson [January 15, 1890 Filipstad, Sweden - September 28, 1976 Stockholm, Sweden], Director of the Geological Survey of Sweden and professor of geology at the Royal Institute of Technology in Stockholm, Sweden for his contributions to the geology and mineralogy of Långban.
Related to UM1984-09-AsO:ClHMn. Also said to be the OH analogue of brattforsite, although with a higher symmetry.

Fluorite structure derivative.

Magnussonite may be the only mineral with univalent manganese. Indeed, in its structure, octahedral [Mn+(AsO3)6] does exist (e.g., Bowell et al. 2015).


Classification of MagnussoniteHide

Approved, 'Grandfathered' (first described prior to 1959)
4.JB.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
B : Arsenites, antimonites, bismuthites; with additional anions, without H2O
46.1.6.1

46 : ANTIMONITES AND ARSENITES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO3)pZq

Physical Properties of MagnussoniteHide

Sub-Vitreous, Resinous, Greasy
Transparency:
Translucent
Comment:
Made be earthy when fine-grained
Colour:
Emerald- or grass-green; bluish green; pale green, olive-green. greenish-tan
Streak:
White
Hardness:
3½ - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Sub-Conchoidal
Density:
4.14 - 4.49 g/cm3 (Measured)    4.55 g/cm3 (Calculated)

Optical Data of MagnussoniteHide

Type:
Isotropic
Pleochroism:
Non-pleochroic

Chemical Properties of MagnussoniteHide

Formula:
Mn10As6O18(OH,Cl)2

initial (Moore & Araki, 1979) structural formula: Mn2+18[As3+6Mn+O18]2Cl2 but it is not necessarily confirmed (or disproved) by further studies
IMA Formula:
Mn2+10As3+6O18(OH,Cl)2

Crystallography of MagnussoniteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Ia3d
Cell Parameters:
a = 19.680 Å
Unit Cell V:
7,622.11 ų (Calculated from Unit Cell)
Z:
32

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000713MagnussoniteMoore P B, Araki T (1979) Magnussonite, manganese arsenite, a fluorite derivative structure American Mineralogist 64 390-40119790293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.01 Å(10)
5.26 Å(5)
4.92 Å(5)
4.02 Å(10)
3.20 Å(5)
3.125 Å(30)
2.850 Å(100)
2.710 Å(5)
2.470 Å(30)
2.350 Å(5)
2.030 Å(5)
1.740 Å(20)
1.700 Å(5)
1.690 Å(5)
1.610 Å(5)
1.480 Å(10)
1.420 Å(5)
Comments:
ICDD 10-407

Geological EnvironmentHide

Geological Setting:
Irregular masses to several cm carbonate-hosted zinc oress.

Type Occurrence of MagnussoniteHide

General Appearance of Type Material:
As finegrained encrustations in fissures in hausmannite impregnated dolomite or in finegrained hematite.
Associated Minerals at Type Locality:

Other Language Names for MagnussoniteHide

Common AssociatesHide

CalciteCaCO3
FrankliniteZn2+Fe3+2O4
WillemiteZn2SiO4
ZinciteZnO
Associated Minerals Based on Photo Data:
3 photos of Magnussonite associated with FrankliniteZn2+Fe3+2O4
2 photos of Magnussonite associated with CalciteCaCO3
2 photos of Magnussonite associated with AdeliteCaMg(AsO4)(OH)
2 photos of Magnussonite associated with ZinciteZnO
1 photo of Magnussonite associated with PyrobelonitePbMn2+(VO4)(OH)
1 photo of Magnussonite associated with HausmanniteMn2+Mn3+2O4
1 photo of Magnussonite associated with HematiteFe2O3
1 photo of Magnussonite associated with LeadPb
1 photo of Magnussonite associated with ArmangiteMn2+26(AsO3)14(HAsO3)4(CO3)
1 photo of Magnussonite associated with DixeniteCuMn2+14Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6

Related Minerals - Nickel-Strunz GroupingHide

4.JB.05Fetiasite(Fe3+,Fe2+,Ti)3(As2O5)O2Mon.
4.JB.10ManganarsiteMn3(As2O4)(OH)4Trig.
4.JB.15UM1984-09-AsO:ClHMnMn10As6O18(OH)ClTet. 4/mmm (4/m 2/m 2/m) : I41/acd
4.JB.20ArmangiteMn2+26(AsO3)14(HAsO3)4(CO3)Trig. 3 : P3
4.JB.25NanlingiteNa(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14Trig.
4.JB.30AsbecasiteCa3(Ti,Sn4+)Be2(AsO3)6(SiO4)2Trig. 3m : P3c1
4.JB.35StenhuggariteCaFeSb(AsO3)2OTet.
4.JB.40TrigonitePb3Mn2+(AsO3)2(HAsO3)Mon. m
4.JB.45FinnemanitePb5(AsO3)3ClHex. 6/m : P63/m
4.JB.50GebharditePb8(As2O5)2OCl6Mon. 2/m : P21/b
4.JB.55DerbyliteFe3+4Ti3Sb3+O13(OH)Mon. 2/m : P21/m
4.JB.55Tomichite(V,Fe)4Ti3AsO13(OH)Mon. 2/m : P21/m
4.JB.55Graeserite(Fe3+,Ti)4Ti3AsO13(OH)Mon. 2/m : B2/m
4.JB.60Hemloite(Ti,V3+,Fe3+,Al)12(As3+,Sb3+)2O23(OH)Tric. 1 : P1
4.JB.65FreediteCu+Pb8(AsO3)2O3Cl5Mon. 2/m : B2/m
4.JB.70GeorgiadèsitePb4(AsO3)Cl4(OH)Mon.
4.JB.75Ekatite(Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6Hex.

Related Minerals - Dana Grouping (8th Ed.)Hide

46.1.6.1NealitePb4Fe2+(As3+O3)2Cl4 · 2H2OTric. 1 : P1
46.1.6.2UM1984-09-AsO:ClHMnMn10As6O18(OH)ClTet. 4/mmm (4/m 2/m 2/m) : I41/acd

Fluorescence of MagnussoniteHide

Not fluorescent in ultraviolet

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for MagnussoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Gabrielson, O. (1956) Magnussonite, a new arsenite mineral from the Långban mine, Sweden. Arkiv för Mineralogi och Geologi: 2: 133-135.
Fleischer, M. (1957) New mineral names. American Mineralogist: 42: 580-586.
Welin, E. (1968) Notes on the mineralogy of Sweden 6. X-ray powder data for minerals from Långban and the related mineral deposits of Central Sweden. Arkiv för Mineralogi och Geologi: 4: 499-541.
Moore P.B. (1970) Stenhuggarite, a new mineral from Långban and new data on magnussonite. Arkiv för Mineralogi och Geologi:5: 55-62.
Fleischer, M. (1971) New mineral names. American Mineralogist: 56: 631-640.
Moore, P.B., Araki, T. (1979) Magnussonite, manganese arsenite, a fluorite derivative structure. American Mineralogist: 64: 390-401.
Dunn, P.J., Ramik, R.A. (1984) Magnussonite, new chemical data, an occurrence at Sterling Hill, New Jersey, and new data on a related phase from the Brattfors mine, Sweden. American Mineralogist: 69: 800-802.
Hålenius, U., Lindqvist, B. (1996) Chromophoric divalent iron in optically anisotropic magnussonite. European Journal of Mineralogy: 8: 25-34.
Nysten, P. (2003) Yeatmanite and magnussonite from the Garpenberg Norra mine, Bergslagen ore province, Sweden. Canadian Mineralogist: 41: 201-206.
Bowell, R.J., Alpers, C.N., Jamieson, H.E., Nordstrom, D.K., Majzlan, J. (2015) Arsenic - Environmental Geochemistry, Mineralogy and Microbiology. Reviews in Mineralogy and Geochemistry, 79, The Mineralogical Society of America (Chantilly, VA, USA) & Geochemical Society, De Gruyter

Internet Links for MagnussoniteHide

Localities for MagnussoniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Sweden
 
  • Dalarna County
    • Hedemora
      • Garpenberg
Nysten, P. (2003): Yeatmanite and magnussonite from the Garpenberg Norra mine, Bergslagen ore province, Sweden. Can. Mineral., 41, 201-206.
  • Värmland County
    • Filipstad
      • Långban Ore District
Gabrielson, O. (1956): Magnussonite, a new arsenite mineral from the Långban mine, Sweden. Arkiv för Mineralogi och Geologi. 2, 133-135; Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
      • Nordmark Odal Field (Nordmarksberg)
Mineralogical Magazine(1978) 42, 133-136
USA
 
  • New Jersey
    • Sussex County
      • Franklin Mining District
        • Ogdensburg
          • Sterling Hill
Frondel, C.: Arkiv för Mineralogi och Geologi Stockholm:2:571 (1961); Dunn, P.J. & Ramik, R.A.: Am.Min.:69:800-802 (1984); Dunn(1995):Pt5:672.
 
Mineral and/or Locality  
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