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Magnussonite

A valid IMA mineral species - grandfathered

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Photos of Magnussonite (17)Discuss Magnussonite

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Edit Magnussonite Add Synonym Edit CIF structures Clear Cache

Magnussonite, etc.

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Magnussonite, etc.

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Magnussonite

Sterling Mine, Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA

Magnussonite, etc.

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Magnussonite, etc.

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Magnussonite

Sterling Mine, Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA

Magnussonite, etc.

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Magnussonite, etc.

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

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About MagnussoniteHide

Nils H. Magnusson

Formula:

Mn²⁺₁₀(As³⁺O₃)₆(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.

Type Locality:

ⓘ Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Related to UM1984-09-AsO:ClHMn. Also said to be the OH analogue of brattforsite, although with a higher symmetry.

Fluorite structure derivative.

Magnussonite is / may be the only mineral with univalent manganese. Indeed, in its structure, octahedral [Mn⁺(AsO₃)₆] does exist (e.g., Bowell et al. 2015; Hawthorne et al., 2022).

Unique IdentifiersHide

Mindat ID:

2543

Long-form identifier:

mindat:1:1:2543:6

IMA Classification of MagnussoniteHide

IMA status:

Approved, 'Grandfathered' (first described prior to 1959)

IMA Formula:

Mn²⁺₅As³⁺₃O₉(OH,Cl)

Classification of MagnussoniteHide

Strunz-mindat (2026):

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

Dana 8th ed.:

46.1.6.1

46 : ANTIMONITES AND ARSENITES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)_m(XO₃)_pZ_q

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference for Standard
Mnu	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MagnussoniteHide

Lustre:

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

Chemistry of MagnussoniteHide

Mindat Formula:

Mn²⁺₁₀(As³⁺O₃)₆(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

Element Weights:

Element	% weight
Mn	41.591 %
As	34.032 %
O	24.225 %
H	0.153 %

Calculated from ideal end-member formula.

Elements listed:

As, Cl, H, Mn, O - search for minerals with similar chemistry

Crystallography of MagnussoniteHide

Crystal System:

Isometric

Class (H-M):

m3m(4/m32/m) - Hexoctahedral

Space Group:

Ia3d

Cell Parameters:

a = 19.680 Å

Unit Cell V:

7,622.11 Å³ (Calculated from Unit Cell)

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0000713	Magnussonite	Moore P B, Araki T (1979) Magnussonite, manganese arsenite, a fluorite derivative structure American Mineralogist 64 390-401		1979		0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Magnussonite'
loop_
_publ_author_name
'Moore P B'
'Araki T'
_journal_name_full 'American Mineralogist'
_journal_volume 64 
_journal_year 1979
_journal_page_first 390
_journal_page_last 401
_publ_section_title
;
 Magnussonite, manganese arsenite, a fluorite derivative structure
;
_database_code_amcsd 0000713
_chemical_formula_sum 'Mn5.922 Mg.37 Cu.34 As4 O12.134 Cl.534 H.134'
_cell_length_a 19.680
_cell_length_b 19.680
_cell_length_c 19.680
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 7622.111
_exptl_crystal_density_diffrn      4.543
_symmetry_space_group_name_H-M 'I a -3 d'
loop_
_space_group_symop_operation_xyz
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  '3/4+z,3/4-y,1/4+x'
  '1/4+z,1/4-y,3/4+x'
  '3/4-y,3/4+x,1/4-z'
  '1/4-y,1/4+x,3/4-z'
  '3/4+x,3/4-z,1/4+y'
  '1/4+x,1/4-z,3/4+y'
  '3/4-z,3/4+y,1/4-x'
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  '3/4+y,3/4-x,1/4+z'
  '1/4+y,1/4-x,3/4+z'
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  '3/4+z,1/4+y,1/4-x'
  '1/4-y,3/4-x,3/4+z'
  '3/4-y,1/4-x,1/4+z'
  '1/4+x,3/4+z,3/4-y'
  '3/4+x,1/4+z,1/4-y'
  '1/4-z,3/4-y,3/4+x'
  '3/4-z,1/4-y,1/4+x'
  '1/4+y,3/4+x,3/4-z'
  '3/4+y,1/4+x,1/4-z'
  '-z,-x,-y'
  '1/2-z,1/2-x,1/2-y'
  'y,z,x'
  '1/2+y,1/2+z,1/2+x'
  '-x,-y,-z'
  '1/2-x,1/2-y,1/2-z'
  'z,x,y'
  '1/2+z,1/2+x,1/2+y'
  '-y,-z,-x'
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loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Mn1   0.25000   0.37500   0.00000   0.95000
Mg1   0.25000   0.37500   0.00000   0.05000
Mn2   0.23263   0.12500   0.01737   0.33000
Cu2   0.23263   0.12500   0.01737   0.17000
Mn3   0.37500   0.26423   0.01423   0.94000
Mg3   0.37500   0.26423   0.01423   0.06000
Mn4   0.11266   0.36266   0.12500   0.90000
Mg4   0.11266   0.36266   0.12500   0.10000
Mn5   0.00750   0.01340  -0.00073   0.15800
As   0.49912   0.36620   0.00839   1.00000
O1   0.56979   0.32014   0.03660   1.00000
O2   0.46116   0.31841  -0.05683   1.00000
O3   0.44445   0.33379   0.07270   1.00000
Cl   0.14136   0.10864   0.12500   0.26700
O-H   0.14136   0.10864   0.12500   0.06700

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
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

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
High-? alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits
Stage 7: Great Oxidation Event	<2.4
47a : [Near-surface hydration of prior minerals]
47d : [Arsenates, antimonates, selenates, bismuthinates]
47e : [Vanadates, chromates, manganates]
47h : [Near-surface oxidized, dehydrated minerals]

Geological Setting:

Irregular masses to several cm carbonate-hosted zinc oress.

Type Occurrence of MagnussoniteHide

Type Locality:

ⓘ Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

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

Dutch:Magnussoniet

German:Magnussonit

Russian:Магнуссонит

Spanish:Magnussonita

Common AssociatesHide

Associations Based on Photo Data:

16 photos of Magnussonite associated with Franklinite	Zn²⁺Fe³⁺₂O₄
15 photos of Magnussonite associated with Zincite	ZnO
14 photos of Magnussonite associated with Calcite	CaCO₃
13 photos of Magnussonite associated with Willemite	Zn₂SiO₄
8 photos of Magnussonite associated with Adelite	CaMg(AsO₄)(OH)
4 photos of Magnussonite associated with Hausmannite	Mn²⁺Mn³⁺₂O₄
3 photos of Magnussonite associated with Allactite	Mn²⁺₇(AsO₄)₂(OH)₈
3 photos of Magnussonite associated with Dolomite	CaMg(CO₃)₂
1 photo of Magnussonite associated with Dixenite	CuMn²⁺₁₄Fe²⁺(SiO₄)₂(As⁵⁺O₄)(As³⁺O₃)₅(OH)₆
1 photo of Magnussonite associated with Armangite	Mn²⁺₂₆(AsO₃)₁₄(HAsO₃)₄(CO₃)

Related Minerals - Strunz-mindat Grouping Hide

4.JB.	Cuyaite	Ca₂Mn³⁺As³⁺₁₄O₂₄Cl	Mon. m
4.JB.	Brattforsite	Mn₁₉(AsO ₃)₁₂Cl₂	Mon. 2/m : B2/b
4.JB.05	Fetiasite	(Fe³⁺,Fe²⁺,Ti)₃(As₂O₅)O₂	Mon. 2/m : P2₁/m
4.JB.10	Manganarsite	Mn₃(As₂O₄)(OH)₄	Trig.
4.JB.15	'UM1984-09-AsO:ClHMn'	Mn₁₀As₆O₁₈(OH)Cl	Tet. 4/mmm(4/m2/m2/m) : I4₁/acd
4.JB.20	Armangite	Mn²⁺₂₆(AsO₃)₁₄(HAsO₃)₄(CO₃)	Trig. 3 : P3
4.JB.25	Nanlingite	Na(Ca₅Li)Mg₁₂(AsO₃)₂[Fe(AsO₃)₆]F₁₄	Trig. 3m(32/m) : R3m
4.JB.30	Asbecasite	Ca₃(Ti,Sn⁴⁺)Be₂(AsO₃)₆(SiO₄)₂	Trig. 3m : P3c1
4.JB.35	Stenhuggarite	CaFeSb(AsO₃)₂O	Tet. 4/mmm(4/m2/m2/m) : I4₁/amd
4.JB.40	Trigonite	Pb₃Mn²⁺(AsO₃)₂(HAsO₃)	Mon. m
4.JB.45	Finnemanite	Pb₅(AsO₃)₃Cl	Hex. 6/m : P6₃/m
4.JB.50	Gebhardite	Pb₈(As₂O₅)₂OCl₆	Mon. 2/m : P2₁/b
4.JB.55	Graeserite	Fe³⁺₄Ti₃As³⁺O₁₃(OH)	Mon. 2/m : B2/m
4.JB.55	Tomichite	(V,Fe)₄Ti₃AsO₁₃(OH)	Mon. 2/m : P2₁/m
4.JB.55	Derbylite	Fe³⁺₄Ti₃Sb³⁺O₁₃(OH)	Mon. 2/m : P2₁/m
4.JB.60	Hemloite	(Ti,V³⁺,Fe³⁺,Al)₁₂(As³⁺,Sb³⁺)₂O₂₃(OH)	Tric. 1 : P1
4.JB.65	Freedite	Cu⁺Pb₈(AsO₃)₂O₃Cl₅	Mon. 2/m : B2/m
4.JB.70	Georgiadesite	Pb₄(As³⁺O₃)Cl₄(OH)	Mon. 2/m : P2₁/b
4.JB.75	Szklaryite	◻Al₆BAs³⁺₃O₁₅	Orth. mmm(2/m2/m2/m) : Pbcm
4.JB.75	Ekatite	(Fe³⁺,Fe²⁺,Zn)₁₂(AsO₃)₆(AsO₃,HSiO₄)₂(OH)₆	Hex. 6mm : P6₃mc
4.JB.85	Lepageite	Mn²⁺₃(Fe³⁺₇Fe²⁺₄)O₃[Sb³⁺₅As³⁺₈O₃₄]	Tric. 1 : P1
4.JB.90	Bianchiniite	Ba₂(TiV)(As₂O₅)₂OF	Tet. 4/mmm(4/m2/m2/m) : I4/mcm

Fluorescence of MagnussoniteHide

In UV light:

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.

Internet Links for MagnussoniteHide

mindat.org URL:

https://www.mindat.org/min-2543.html
Please feel free to link to this page.

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

Mineral Dealers:

Buy from D. Joyce minerals

References for MagnussoniteHide

Reference List:

Gabrielson, O. (1957) Magnussonite, a new arsenite mineral from the Långban mine in Sweden. Arkiv för Mineralogi och Geologi, 2 (1-2). 133-135

Fleischer, M. (1957) New mineral names. American Mineralogist, 42 (7-8) 580-586

Welin, E. (1969) 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 (6, nr 30). 499-541

Moore, P.B. (1970) Stenhuggarite, a new mineral from Långban and new data on magnussonite. Arkiv för Mineralogi och Geologi, 5. 55-61

Fleischer, Michael (1971) New Mineral Names. American Mineralogist, 56 (3-4) 631-640

Moore, Paul B., Araki, Takaharu (1979) Magnussonite, manganese arsenite, a fluorite derivative structure. American Mineralogist, 64 (3-4) 390-401

Dunn, Pete J., Ramik, Robert 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 (7-8) 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. The Canadian Mineralogist, 41 (1) 201-206 doi:10.2113/gscanmin.41.1.201

(2005) Magnussonite. Handbook of Mineralogy. Mineralogical Society of America

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

Hawthorne, Frank C., Hughes, John M., Ma, Chi (2022) Magnussonite, Mn²⁺₁₈(As³⁺O₃)₆Mn^1+x(H₂O,Cl_x,☐): Re-Examination of the Structure and the [Mn¹⁺(As³⁺O₃)₆] Cluster. Crystals, 12 (9). 1221 doi:10.3390/cryst12091221

Localities for MagnussoniteHide

Showing 4 localities.

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.

Hide all sections | Show all sections

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Sweden
Dalarna County Hedemora Garpenberg ⓘ Garpenberg Norra Mine	Nysten (2003) +1 other reference
Värmland County Filipstad Långban Ore District ⓘ Långban Mine (TL)	Gabrielson (1957) +2 other references
Nordmark Odal Field ⓘ Brattfors Mine	Moore (1978)

USA
New Jersey Sussex County Ogdensburg Sterling Hill ⓘ Sterling Mine	Frondel (1961) +2 other references

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Magnussonite

About MagnussoniteHide

Unique IdentifiersHide

IMA Classification of MagnussoniteHide

Classification of MagnussoniteHide

Mineral SymbolsHide

Physical Properties of MagnussoniteHide

Optical Data of MagnussoniteHide

Chemistry of MagnussoniteHide

Crystallography of MagnussoniteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of MagnussoniteHide

Other Language Names for MagnussoniteHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Fluorescence of MagnussoniteHide

Other InformationHide

Internet Links for MagnussoniteHide

References for MagnussoniteHide

Localities for MagnussoniteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide