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Manganohörnesite

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Formula:
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
System:MonoclinicColour:white to colorless
Hardness:1
Member of:Vivianite Group
Name:Named by Olof Gabrielson for being the Manganese analogue of hörnesite.
Isostructural with:Vivianite Group

Classification of Manganohörnesite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Nickel-Strunz 10th (pending) edition ID:8.CE.40

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
Dana 8th edition ID:40.3.7.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
Hey's CIM Ref.:20.8.12

20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
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Type Occurrence of Manganohörnesite

Type Locality:Långban, Filipstad, Värmland, Sweden
Year of Discovery:1854
Geological Setting of type material:Fractures in manganese skarn
Associated Minerals at type locality:
SynadelphiteRhodochrositeQuartzNadorite

Occurrences of Manganohörnesite

Geological Setting:Fractures in manganese-bearing ores

Physical Properties of Manganohörnesite

Lustre:Silky
Diaphaneity (Transparency):Transparent
Comment:Because of common acicular habit
Colour:white to colorless
Streak:White
Hardness (Mohs):1
Tenacity:Flexible
Cleavage:Perfect
{01`0} perfect, poor on {100}, {201}, {201}
Density (measured):2.64 g/cm3
Density (calculated):2.76 g/cm3

Crystallography of Manganohörnesite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P2/m {P1 1 2/m} {P2/m} {P1 2/m 1}
Space Group Setting:P2/m
Cell Parameters:a = 10.385Å, b = 28.095Å, c = 4.774Å
β = 105.67°
Ratio:a:b:c = 0.37 : 1 : 0.17
Unit Cell Volume:V 1,341.12 ų (Calculated from Unit Cell)
Z:4
Morphology:Usually acicular
X-Ray Powder Diffraction:
d-spacingIntensity
8.19 (80)
7.01 (100)
3.25 (60)
3.09 (60)
3.02 (70)
2.88 (40)
2.72 (40)
2.41 (70)
Comments:ICDD 8-141

Optical Data of Manganohörnesite

Type:Biaxial (+)
RI values: nα = 1.579 nβ = 1.589 nγ = 1.609
2V:Measured: 65° to 70°, Calculated: 72°
Birefringence:0.030
Maximum Birefringence:δ = 0.030

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:very weak
Optical Extinction:Z nearly = c
Pleochroism:Not Visible

Chemical Properties of Manganohörnesite

Formula:
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
Essential elements:As, H, Mn, O
All elements listed in formula:As, H, Mg, Mn, O

Relationship of Manganohörnesite to other Species

Member of:Vivianite Group
Other Members of Group:

- +
Annabergite
Ni
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
Arupite
Ni
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
Babánekite
Cu
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
Barićite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
Erythrite
Co
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
Köttigite
Zn
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
Pakhomovskyite
Co
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
Parasymplesite
Fe
2+
3
(AsO
 
4
)
 
2
· 8H
 
2
O
Vivianite
Fe
2+
3
(PO
 
4
)
 
2
· 8H
 
2
O
Common Associates:
KraissliteKraissliteCalciteAlleghanyiteAdelite
Related Minerals - Nickel-Strunz Grouping):

- +
8.CE.05Chudobaite
(Mg,Zn)
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 10H
 
2
O
8.CE.05Geigerite
Mn
2+
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 10H
 
2
O
8.CE.10Newberyite
Mg(HPO
 
4
) · 3H
 
2
O
8.CE.15Brassite
Mg(HAsO
 
4
) · 4H
 
2
O
8.CE.20Phosphorrösslerite
Mg(HPO
 
4
) · 7H
 
2
O
8.CE.20Rösslerite
Mg(HAsO
 
4
) · 7H
 
2
O
8.CE.25Metaswitzerite
Mn
 
3
(PO
 
4
)
 
2
· 4H
 
2
O
8.CE.25Switzerite
(Mn,Fe)
 
3
(PO
 
4
)
 
2
· 7H
 
2
O
8.CE.30Lindackerite
CuCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 8-9H
 
2
O
8.CE.30Ondrušite
CaCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 10H
 
2
O
8.CE.30Veselovskýite
ZnCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9H
 
2
O
8.CE.30Pradetite
CoCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9H
 
2
O
8.CE.30Klajite
MnCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9-10H
 
2
O
8.CE.35Bobierrite
Mg
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Annabergite
Ni
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Arupite
Ni
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Barićite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Erythrite
Co
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Ferrisymplesite
Fe
3+
3
(AsO
 
4
)
 
2
(OH)
 
3
· 5H
 
2
O
8.CE.40Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Köttigite
Zn
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Parasymplesite
Fe
2+
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Vivianite
Fe
2+
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Pakhomovskyite
Co
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.45Symplesite
Fe
2+
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.50Cattiite
Mg
 
3
(PO
 
4
)
 
2
· 22H
 
2
O
8.CE.55Koninckite
Fe
3+
 
PO
 
4
· 3H
 
2
O
8.CE.60Kaňkite
FeAsO
 
4
· 3.5H
 
2
O
8.CE.65Steigerite
Al(VO
 
4
) · 3H
 
2
O
8.CE.70Metaschoderite
Al
 
2
(PO
 
4
)(VO
 
4
) · 6H
 
2
O
8.CE.70Schoderite
Al
 
2
(PO
 
4
)(VO
 
4
) · 8H
 
2
O
8.CE.75Malhmoodite
FeZr(PO
 
4
)
 
2
· 4H
 
2
O
8.CE.75Zigrasite
MgZr(PO
 
4
)
 
2
· 4H
 
2
O
8.CE.75Unnamed (Ca-analogue of Zigrasite)
CaZr[PO
 
4
]
 
2
· 4H
 
2
O
8.CE.80Santabarbaraite
Fe
3+
3
(PO
 
4
)
 
2
(OH)
 
3
· 5H
 
2
O
8.CE.85Metaköttigite
(Zn,Fe,Fe)
 
3
(AsO
 
4
)
 
2
· 8(H
 
2
O,OH)
Related Minerals - Hey's Index Grouping:

- +
20.8.1Sarkinite
Mn
2+
2
(AsO
 
4
)(OH)
20.8.2Eveite
Mn
2+
2
(AsO
 
4
)(OH)
20.8.3Arsenoclasite
Mn
2+
5
(AsO
 
4
)
 
2
(OH)
 
4
20.8.4Flinkite
Mn
2+
2
Mn
3+
 
(AsO
 
4
)(OH)
 
4
20.8.5Jarosewichite
Mn
2+
3
Mn
3+
 
(AsO
 
4
)(OH)
 
6
20.8.6Allactite
Mn
2+
7
(AsO
 
4
)
 
2
(OH)
 
8
20.8.7Krautite
Mn(HAsO
 
4
) · H
 
2
O
20.8.8Synadelphite
Mn
2+
9
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
9
· 2H
 
2
O
20.8.9Sterlinghillite
Mn
 
3
(AsO
 
4
)
 
2
· 4H
 
2
O
20.8.10Geigerite
Mn
2+
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 10H
 
2
O
20.8.11Akrochordite
(Mn
2+
 
,Mg)
 
5
(AsO
 
4
)
 
2
(OH)
 
4
· 4H
 
2
O
20.8.13Fluckite
CaMn
2+
 
(HAsO
 
4
)
 
2
· 2H
 
2
O
20.8.14Brandtite
Ca
 
2
(Mn
2+
 
,Mg)(AsO
 
4
)
 
2
· 2H
 
2
O
20.8.15Parabrandtite
Ca
 
2
Mn
2+
 
(AsO
 
4
)
 
2
· 2H
 
2
O
20.8.16Wallkilldellite-(Mn)
Ca
 
2
Mn
2+
3
(AsO
 
4
)
 
2
(OH)
 
4
· 9H
 
2
O
20.8.17Berzeliite
NaCa
 
2
(Mg,Mn
2+
 
)
 
2
(AsO
 
4
)
 
3
20.8.18Manganberzeliite
(Ca,Na)
 
3
(Mn
2+
 
,Mg)
 
2
(AsO
 
4
)
 
3
20.8.19Magnesiochlorophoenicite
(Mg,Mn)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
20.8.20Villyaellenite
MnMn
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 4H
 
2
O
20.8.21Hematolite
(Mn,Mg,Al)
 
15
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
23
20.8.22Grischunite
NaCa
 
2
Mn
2+
5
Fe
3+
 
(AsO
 
4
)
 
6
· 2H
 
2
O

Other Names for Manganohörnesite

Synonyms:
Manganese-hörnesite
Other Languages:
German:Manganhörnesit

Other Information

Fluorescence in UV light:Not fluorescent.
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 Manganohörnesite

Reference List:

- +
Gabrielson, O. (1951): Manganiferous hoernesite and manganese-hoernesite from Långban, Sweden, Arkiv för Mineralogi och Geologi, 1, 333-337.

American Mineralogist (1954): 39: 159.

Internet Links for Manganohörnesite

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  • Localities for Manganohörnesite

    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.
    (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.
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Schenkenzell
    Walenta, K. (2001): Neue Mineralfunde aus dem Schwarzwald. 8. Folge, 1. Teil. Lapis, 26 (2), 39-42.
    Sweden
     
    • Värmland
      • Filipstad
    Arkiv Min.Geol.(1951) 1, 333-337; 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.
    No reference listed
        • Persberg district
          • Pajsberg
    Nysten, P. (2004): Harstigen ett mineralogisk eldorado i Bergslagen. Norsk Bergverksmuseum Skrift 28: 5-13
    Switzerland
     
    • Wallis (Valais)
      • Turtmann Valley
        • Pipjitälli
    Ansermet, S. (2012): Mines et minéraux du Valais - II. Anniviers et Tourtemagne. With contributions by N. Meisser, Ed. Porte-plumes (Ayer)
    USA
     
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Ogdensburg
            • Sterling Hill
    Parker, F. J. & Troy, J.: Min.Rec.:13:35-38 (1982); Dunn(1995):Pt5:673.
    Mineral and/or Locality
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