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Armangite

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Långban, Filipstad, Värmland, Sweden

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Formula:
Mn
2+
26
(AsO
 
3
)
 
14
(HAsO
 
3
)
 
4
(CO
 
3
)
System:TrigonalColour:Black to pale brown; ...
Hardness:4
Name:In allusion to the composition, containing ARsenic and MANGanese.
This page provides mineralogical data about Armangite.

Classification of Armangite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/J.05-40
Nickel-Strunz 10th (pending) edition ID:4.JB.20

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 edition ID:46.2.7.1

46 : ANTIMONITES AND ARSENITES CONTAINING HYDROXYL OR HALOGEN
2 : Miscellaneous
Hey's CIM Ref.:23.17

23 : Arsenites
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Type Occurrence of Armangite

Type Locality:Långban, Filipstad, Värmland, Sweden
General Appearance of Type Material:tiny prismatic crystals
Place of Conservation of Type Material:Swedish Museum of Natural History, Stockholm, Sweden (Flink U71);
U.S. National Museum of Natural History, Washington, D.C., USA (No. R5795)
Year of Discovery:1920
Geological Setting of type material:Museum specimen collected from a metamorphosed Fe-Mn deposit
Associated Minerals at type locality:
ManganarsiteHematiteHausmanniteFluoriteDolomite
CalciteBaryte

Physical Properties of Armangite

Diaphaneity (Transparency):Opaque
Colour:Black to pale brown; yellow to brown in transmitted light
Streak:Brown
Hardness (Mohs):4
Cleavage:Imperfect/Fair
Fair to poor on {0001}.
Density (measured):4.43 g/cm3
Density (calculated):4.406 g/cm3

Crystallography of Armangite

Crystal System:Trigonal
Class (H-M):3 - Rhombohedral
Space Group:P3
Cell Parameters:a = 13.491Å, c = 8.855Å
Ratio:a:c = 1 : 0.656
Unit Cell Volume:V 1,395.75 ų (Calculated from Unit Cell)
Z:1
Morphology:Crystals short hexagonal prisms, terminated by a trigonal pyramid
Twinning:on {1120}.
X-Ray Powder Diffraction:
d-spacingIntensity
2.762 (100)
2.94 (70)
2.428 (70)
1.759 (60)
3.92 (50)
1.676 (50)
1.459 (50)
Comments:Material from Langban, Sweden (ICDD 19-780)

Optical Data of Armangite

Type:Uniaxial (-)
RI values: nω = 2.010 nε = 1.990
Maximum Birefringence:δ = 0.020

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Pleochroism:Non-pleochroic

Chemical Properties of Armangite

Formula:
Mn
2+
26
(AsO
 
3
)
 
14
(HAsO
 
3
)
 
4
(CO
 
3
)
Essential elements:As, C, H, Mn, O
All elements listed in formula:As, C, H, Mn, O
Analytical Data:Averages of three analyses of material from Langban, Sweden
The values given in the second row were obtained after deduction of insoluble matter and 3.69 wt.-% of (Ca,Mn,Mg)CO3, and recalculation to 100 wt.-%; essential carbonate however was found by structure analysis and confirmed qualitatively by electron microprobe analysis
As2O3 (42.92)  (48.82)
Sb2O3 (0.40)  (0.46)
FeO (2.19)  (2.49)
MnO (45.06)  (47.06)
PbO (0.32)  (0.36)
MgO (0.49)
CaO (2.83)
H2O (0.71)  (0.81)
CO2 (5.08)

insoluble matter (0.20)

sum 100.20 wt.-%
Common Impurities:Fe,Pb,Sb

Relationship of Armangite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JB.05Fetiasite
(Fe
3+
 
,Fe
2+
 
,Ti)
 
3
(As
 
2
O
 
5
)O
 
2
4.JB.10Manganarsite
Mn
 
3
(As
 
2
O
 
4
)(OH)
 
4
4.JB.15Magnussonite
Mn
 
10
As
 
6
O
 
18
(OH,Cl)
 
2
4.JB.15UM1984-09-AsO:ClHMn
Mn
 
10
As
 
6
O
 
18
(OH)Cl
4.JB.25Nanlingite
NaMg
 
4
(AsO
 
3
)
 
2
F
 
4
4.JB.30Asbecasite
Ca
 
3
(Ti,Sn
4+
 
)Be
 
2
(AsO
 
3
)
 
6
(SiO
 
4
)
 
2
4.JB.35Stenhuggarite
CaFeSb(AsO
 
3
)
 
2
O
4.JB.40Trigonite
Pb
 
3
Mn
2+
 
(AsO
 
3
)
 
2
(HAsO
 
3
)
4.JB.45Finnemanite
Pb
 
5
(AsO
 
3
)
 
3
Cl
4.JB.50Gebhardite
Pb
 
8
(As
 
2
O
 
5
)
 
2
OCl
 
6
4.JB.55Derbylite
Fe
3+
4
Ti
 
3
Sb
3+
 
O
 
13
(OH)
4.JB.55Tomichite
(V,Fe)
 
4
Ti
 
3
AsO
 
13
(OH)
4.JB.55Graeserite
(Fe
3+
 
,Ti)
 
4
Ti
 
3
AsO
 
13
(OH)
4.JB.60Hemloite
(Ti,V
3+
 
,Fe
3+
 
,Al)
 
12
(As
3+
 
,Sb
3+
 
)
 
2
O
 
23
(OH)
4.JB.65Freedite
Cu
+
 
Pb
 
8
(AsO
 
3
)
 
2
O
 
3
Cl
 
5
4.JB.70Georgiadèsite
Pb
 
4
(AsO
 
3
)Cl
 
4
(OH)
4.JB.75Ekatite
(Fe
3+
 
,Fe
2+
 
,Zn)
 
12
(AsO
 
3
)
 
6
(AsO
 
3
,HSiO
 
4
)
 
2
(OH)
 
6
Related Minerals - Hey's Index Grouping:

- +
23.2Nanlingite
NaMg
 
4
(AsO
 
3
)
 
2
F
 
4
23.3Leiteite
Zn(As
 
2
O
 
4
)
23.5Kuznetsovite
(Hg
+
2
)Hg
2+
 
(AsO
 
4
)Cl
23.6Paulmooreite
Pb
 
2
[As
 
2
O
 
5
]
23.7Ecdemite
Pb
 
6
Cl
 
4
(As
 
2
O
 
7
)
23.8Heliophyllite
Pb
 
6
Cl
 
4
(As
 
2
O
 
7
)
23.9Finnemanite
Pb
 
5
(AsO
 
3
)
 
3
Cl
23.10Gebhardite
Pb
 
8
(As
 
2
O
 
5
)
 
2
OCl
 
6
23.11Zimbabweite
(Na,K)
 
2
PbAs
 
4
(Ta,Nb,Ti)
 
4
O
 
18
23.13Rouseite
Pb
 
2
Mn
2+
 
[AsO
 
3
]
 
2
 · 2H
 
2
O
23.14Freedite
Cu
+
 
Pb
 
8
(AsO
 
3
)
 
2
O
 
3
Cl
 
5
23.15Manganarsite
Mn
 
3
(As
 
2
O
 
4
)(OH)
 
4
23.18Karibibite
Fe
 
2
As
 
4
O
 
9
23.19Schneiderhöhnite
Fe
2+
 
Fe
3+
3
[As
 
5
O
 
13
]
23.20Lazarenkoite
(Ca,Fe)FeAs
 
3
O
 
7
 · 3H
 
2
O
23.21Stenhuggarite
CaFeSb(AsO
 
3
)
 
2
O
23.22Tomichite
(V,Fe)
 
4
Ti
 
3
AsO
 
13
(OH)

Other Names for Armangite

Other Languages:
German:Armangit
Russian:Армангит
Spanish:Armangita

Other Information

Other Information:Readily soluble in HCl, separating As2O3, which dissolves on dilution and warming.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Armangite

Reference List:

- +
Aminoff and Mauzelius (1920) Geologiska Föeningens I Stockholm Förhandlinger 42: 301-309.

Aminoff (1933) Svenska Vetenskapsakademien, Stockholm, Handlingar: [3], 11, no. 4: 19.

Larsen, E.S. and Berman, H. (1934) The Microscopic Determination of the Nonopaque Minerals, Second edition, USGS Bulletin 848: 91.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 1031-1032.

Moore, P. B. and Araki, T. (1979): Armangite, Mn26[As6(OH)4O14][As6O18]2[CO3], a fluorite derivative structure. American Mineralogist 64, 748-757.

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 23.

Internet Links for Armangite

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    • Localities for Armangite

    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Sweden
     
    • Värmland
      • Filipstad
    		Aminoff & Mauzelius (1920) Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm: 42, 301-309; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1032; 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 (Nordmarksberg)
    		No reference listed
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