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Arsenoclasite

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Långban, Filipstad, Värmland, Sweden
© Knut Eldjarn

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Formula:
Mn
2+
5
(AsO
 
4
)
 
2
(OH)
 
4
System:OrthorhombicColour:Red
Hardness:5 - 6
Name:From the Greek αρσενικόν for "arsenic" and κλάσις for "cleavage," in allusion to its arsenic content and perfect cleavage.


Isostructural with its phosphate analogue gatehouseite.

Related to reppiatite.

Classification of Arsenoclasite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/B.11-70
Nickel-Strunz 10th (pending) edition ID:8.BD.10

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
D : With only medium-sized cations, (OH, etc.):RO4= 2:1
Dana 8th edition ID:41.4.1.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
4 : (AB)5(XO4)2Zq
Hey's CIM Ref.:20.8.3

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

Type Locality:Långban, Filipstad, Värmland, Sweden
Year of Discovery:1931
Geological Setting of type material:Dolomite impregnated with Hausmannite.
Associated Minerals at type locality:
SarkiniteHausmanniteAdelite

Physical Properties of Arsenoclasite

Colour:Red
Hardness (Mohs):5 - 6
Cleavage:Perfect
On {010}, perfect.
Density (measured):4.16 g/cm3
Density (calculated):4.27 g/cm3

Crystallography of Arsenoclasite

Crystal System:Orthorhombic
Cell Parameters:a = 9.31Å, b = 5.75Å, c = 18.29Å
Ratio:a:b:c = 1.619 : 1 : 3.181
Unit Cell Volume:V 979.11 ų (Calculated from Unit Cell)
Morphology:Massive, granular.

Optical Data of Arsenoclasite

Type:Biaxial (-)
RI values: nα = 1.787 nβ = 1.810 nγ = 1.816
2V:Measured: 53° , Calculated: 52°
Maximum Birefringence:δ = 0.029

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

Chemical Properties of Arsenoclasite

Formula:
Mn
2+
5
(AsO
 
4
)
 
2
(OH)
 
4
Essential elements:As, H, Mn, O
All elements listed in formula:As, H, Mn, O

Relationship of Arsenoclasite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BD.05Cornwallite
Cu
 
5
(AsO
 
4
)
 
2
(OH)
 
4
8.BD.05Pseudomalachite
Cu
 
5
(PO
 
4
)
 
2
(OH)
 
4
8.BD.05Reichenbachite
Cu
 
5
(PO
 
4
)
 
2
(OH)
 
4
8.BD.10Gatehouseite
Mn
2+
5
(PO
 
4
)
 
2
(OH)
 
4
8.BD.15Parwelite
Mn
 
10
Sb
 
2
As
 
2
Si
 
2
O
 
24
8.BD.20Reppiaite
Mn
2+
5
(VO
 
4
)
 
2
(OH)
 
4
8.BD.25Ludjibaite
Cu
 
5
(PO
 
4
)
 
2
(OH)
 
4
8.BD.30Cornubite
Cu
 
5
(AsO
 
4
)
 
2
(OH)
 
4
Related Minerals - Hey's Index Grouping:

- +
20.8.1Sarkinite
Mn
2+
2
(AsO
 
4
)(OH)
20.8.2Eveite
Mn
2+
2
(AsO
 
4
)(OH)
20.8.4Flinkite
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
20.8.12Manganohörnesite
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
 · 8H
 
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 Arsenoclasite

Synonyms:
Arsenoklasite
Other Languages:
German:Arsenoclasit
Arsenoklasit
Russian:Арсеноклазит
Spanish:Arsenoclasita
Arsenoklasita

Other Information

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 Arsenoclasite

Reference List:

- +
Aminoff (1931) Kungl. Svenska Vetenskap. Handl.: 9, no. 5: 52 (as Arsenoklasit).

Spencer (1931) Mineral Abstracts: 4: 496.

American Mineralogist (1932): 17: 251.

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.: 801-802.

Moore, P.B. (1968) Contributions to Swedish mineralogy. I. Studies on the basic arsenates of manganese: retzian, hemafibrite, synadelphite, arsenoclasite, arseniopleite, and akrochordite. Arkiv. Mineral. Geol., 4(5), 425–444.

American Mineralogist (1971): 56: 1539-1552.

Internet Links for Arsenoclasite

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    • Localities for Arsenoclasite

    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.
    Australia
     
    • South Australia
      • Eyre Peninsula
        • Middleback Range
          • Iron Knob
    		Anthony, Bideaux, Bladh, Nichols: Handbook of Mineralogy, Vol. IV
    Italy
     
    • Liguria
      • Genova Province
        • Ne
          • Graveglia Valley
            • Reppia
    		P.M. Kartashov analytical data, specimen from Luigi Chiappino
    Sweden
     
    • Värmland
      • Filipstad
    		KVA handl.(1931) 9, 52-57; 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.
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