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Arsenoclasite

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Formula:
Mn52+(AsO4)2(OH)4
System:
Orthorhombic
Colour:
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 reppiaite.

Classification of Arsenoclasite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
41.4.1.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
4 : (AB)5(XO4)2Zq
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

Year of Discovery:
1931
Geological Setting of Type Material:
Dolomite impregnated with Hausmannite.
Associated Minerals at Type Locality:

Physical Properties of Arsenoclasite

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

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°
Max Birefringence:
δ = 0.029
Image 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:
Mn52+(AsO4)2(OH)4
Essential elements:
All elements listed in formula:

Relationship of Arsenoclasite to other Species

8.BD.05CornwalliteCu5(AsO4)2(OH)4
8.BD.05PseudomalachiteCu5(PO4)2(OH)4
8.BD.05ReichenbachiteCu5(PO4)2(OH)4
8.BD.10GatehouseiteMn52+(PO4)2(OH)4
8.BD.15ParweliteMn10Sb2As2Si2O24
8.BD.20ReppiaiteMn52+(VO4)2(OH)4
8.BD.25LudjibaiteCu5(PO4)2(OH)4
8.BD.30CornubiteCu5(AsO4)2(OH)4
20.8.1SarkiniteMn22+(AsO4)(OH)
20.8.2EveiteMn22+(AsO4)(OH)
20.8.4FlinkiteMn22+Mn3+(AsO4)(OH)4
20.8.5JarosewichiteMn32+Mn3+(AsO4)(OH)6
20.8.6AllactiteMn72+(AsO4)2(OH)8
20.8.7KrautiteMn(HAsO4) · H2O
20.8.8SynadelphiteMn92+(As5+O4)2(As3+O3)(OH)9 · 2H2O
20.8.9SterlinghilliteMn3(AsO4)2 · 4H2O
20.8.10GeigeriteMn52+(AsO4)2(HAsO4)2 · 10H2O
20.8.11Akrochordite(Mn2+,Mg)5(AsO4)2(OH)4 · 4H2O
20.8.12Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2O
20.8.13FluckiteCaMn2+(HAsO4)2 · 2H2O
20.8.14BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2O
20.8.15ParabrandtiteCa2Mn2+(AsO4)2 · 2H2O
20.8.16Wallkilldellite-(Mn)Ca2Mn32+(AsO4)2(OH)4 · 9H2O
20.8.17BerzeliiteNaCa2(Mg,Mn2+)2(AsO4)3
20.8.18Manganberzeliite(Ca,Na)3(Mn2+,Mg)2(AsO4)3
20.8.19Magnesiochlorophoenicite(Mg,Mn)3Zn2(AsO4)(OH,O)6
20.8.20VillyaelleniteMnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O
20.8.21Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23
20.8.22GrischuniteNaCa2Mn52+Fe3+(AsO4)6 · 2H2O

Other Names for Arsenoclasite

Other Information

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 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

Localities for Arsenoclasite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (TL)
 
  • 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.
Holtstam, D. & Langhof, J. eds. (1999): Långban: The mines, their minerals, geology and explorers. Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, p. 89
Mineral and/or Locality  
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