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Armangite

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About ArmangiteHide

Formula:
Mn2+26(AsO3)14(HAsO3)4(CO3)
Colour:
Black to pale brown; yellow to brown in transmitted light
Hardness:
4
Specific Gravity:
4.43
Crystal System:
Trigonal
Name:
In allusion to the composition, containing ARsenic and MANGanese.
This page provides mineralogical data about Armangite.


Classification of ArmangiteHide

Approved, 'Grandfathered' (first described prior to 1959)
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
46.2.7.1

46 : ANTIMONITES AND ARSENITES CONTAINING HYDROXYL OR HALOGEN
2 : Miscellaneous
23.17

23 : Arsenites

Physical Properties of ArmangiteHide

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

Optical Data of ArmangiteHide

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

Formula:
Mn2+26(AsO3)14(HAsO3)4(CO3)
IMA Formula:
Mn2+26[As3+6(OH)4O14][As3+6O18]2(CO3)
Common Impurities:
Fe,Pb,Sb

Crystallography of ArmangiteHide

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
P3
Cell Parameters:
a = 13.491 Å, c = 8.855 Å
Ratio:
a:c = 1 : 0.656
Unit Cell 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 DiffractionHide

Powder Diffraction Data:
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)

Type Occurrence of ArmangiteHide

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)
Geological Setting of Type Material:
Museum specimen collected from a metamorphosed Fe-Mn deposit
Associated Minerals at Type Locality:

Other Language Names for ArmangiteHide

German:Armangit
Spanish:Armangita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Baryte1 photo of Armangite associated with Baryte on mindat.org.
Magnussonite1 photo of Armangite associated with Magnussonite on mindat.org.
Lead1 photo of Armangite associated with Lead on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.JB.05Fetiasite(Fe3+,Fe2+,Ti)3(As2O5)O2Mon.
4.JB.10ManganarsiteMn3(As2O4)(OH)4
4.JB.15MagnussoniteMn10As6O18(OH,Cl)2Iso. m3m (4/m 3 2/m) : Ia3d
4.JB.15UM1984-09-AsO:ClHMnMn10As6O18(OH)ClTet. 4/mmm (4/m 2/m 2/m) : I41/acd
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.
4.JB.55DerbyliteFe3+4Ti3Sb3+O13(OH)Mon. 2/m : P21/m
4.JB.55Tomichite(V,Fe)4Ti3AsO13(OH)Mon.
4.JB.55Graeserite(Fe3+ ,Ti)4Ti3AsO13(OH)Mon.
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 - Hey's Chemical Index of Minerals GroupingHide

23.2NanlingiteNa(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14Trig.
23.3LeiteiteZn(As2O4)Mon. 2/m : P21/b
23.5Kuznetsovite(Hg+2)Hg2+(AsO4)ClIso. 2 3 : P21 3
23.6PaulmooreitePb2[As2O5]Mon. 2/m : P21/b
23.7EcdemitePb6Cl4(As2O7)Tet.
23.8HeliophyllitePb6Cl4(As2O7)Orth.
23.9FinnemanitePb5(AsO3)3ClHex. 6/m : P63/m
23.10GebharditePb8(As2O5)2OCl6Mon.
23.11Zimbabweite(Na,K)2PbAs4(Ta,Nb,Ti)4O18Orth.
23.13RouseitePb2Mn2+[AsO3]2 · 2H2OTric.
23.14FreediteCu+Pb8(AsO3)2O3Cl5Mon. 2/m : B2/m
23.15ManganarsiteMn3(As2O4)(OH)4
23.18KaribibiteFe3+3(As3+O2)4(As3+2O5)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
23.19SchneiderhöhniteFe2+Fe3+3As3+5O13Tric. 1 : P1
23.20Lazarenkoite(Ca,Fe2+)Fe3+As3+3O7 · 3H2OOrth.
23.21StenhuggariteCaFeSb(AsO3)2OTet.
23.22Tomichite(V,Fe)4Ti3AsO13(OH)Mon.

Other InformationHide

Notes:
Readily soluble in HCl, separating As2O3, which dissolves on dilution and warming.
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 ArmangiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Aminoff, G., Mauzelius, R. (1920) Armangite, a new arsenite from Långbanshyttan. Geologiska Föeningens I Stockholm Förhandlinger: 42: 301-309.
Wherry, E.T., Gordon, S.G., Foshag, W.F. (1921) New minerals. American Mineralogist: 6: 63-68.
Aminoff (1933) Svenska Vetenskapsakademien, Stockholm, Handlingar: [3], 11(4): 19.
Larsen, E.S., 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.
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(30): 499-541.
Moore, P.B., 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 ArmangiteHide

Localities for ArmangiteHide

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 (TL)
 
  • Värmland
    • Filipstad
Aminoff & Mauzelius (1920) Geologiska Föreningens 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.
Nysten, P. (1987). Armangite from Nordmark. GFF, 109(2), 110-110.
No reference listed
Nysten, P. (1987). Armangite from Nordmark. GFF, 109(2), 110-110.
Mineral and/or Locality  
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