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(Co,Mg)Fe23+(AsO4)2(OH)2 · 4H2O
yellowish brown to straw ...
Vitreous, Silky
3½ - 4
Member of:
Named as the cobalt analogue of Arthurite.
Arthurite Group.
The cobalt analogue of Arthurite.

Classification of Cobaltarthurite

Approved 2001

D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1

11 : (AB)3(XO4)2Zq·xH2O URL:
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Type Occurrence of Cobaltarthurite

General Appearance of Type Material:
globular and pellet-like aggregates up to 1.5 mm in diameter, consisiting of radial fibers and non-fibrous material

Physical Properties of Cobaltarthurite

Vitreous, Silky
Diaphaneity (Transparency):
yellowish brown to straw yellow
white to pale brown
Hardness (Mohs):
3½ - 4
Hardness Data:
None Observed
3.22 g/cm3 (Measured)    

Crystallography of Cobaltarthurite

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 10.27Å, b = 9.72Å, c = 5.545Å
β = 94.46°
a:b:c = 1.057 : 1 : 0.57
Unit Cell Volume:
V 551.85 ų

Optical Data of Cobaltarthurite

Biaxial (+)
RI values:
nα = 1.741 nβ = 1.762 nγ = 1.797
Max Birefringence:
δ = 0.056
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of Cobaltarthurite

(Co,Mg)Fe23+(AsO4)2(OH)2 · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Cobaltarthurite to other Species

Member of:
Other Members of Group:
ArthuriteCuFe23+(AsO4)2(OH)2 · 4H2O
BendadaiteFe2+Fe23+(AsO4)2(OH)2 · 4H2O
EarlshannoniteMn2+Fe23+(PO4)2(OH)2 · 4H2O
KunatiteCuFe23+(PO4)2(OH)2 · 4H2O
OjuelaiteZnFe23+(AsO4)2(OH)2 · 4H2O
UKI-2006-(PO:AlCuFeH)Fe2+Al3(PO4)2(OH)2 · 4H2O
UKI-2006-(PO:FeHZn)ZnFe23+(PO4)2(OH)2 · 4H2O
WhitmoreiteFe2+Fe23+(PO4)2(OH)2 · 4H2O
8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2O
8.DC.07EuchroiteCu2(AsO4)(OH) · 3H2O
8.DC.10LegranditeZn2(AsO4)(OH) · H2O
8.DC.12StrashimiriteCu8(AsO4)4(OH)4 · 5H2O
8.DC.15ArthuriteCuFe23+(AsO4)2(OH)2 · 4H2O
8.DC.15EarlshannoniteMn2+Fe23+(PO4)2(OH)2 · 4H2O
8.DC.15OjuelaiteZnFe23+(AsO4)2(OH)2 · 4H2O
8.DC.15WhitmoreiteFe2+Fe23+(PO4)2(OH)2 · 4H2O
8.DC.15BendadaiteFe2+Fe23+(AsO4)2(OH)2 · 4H2O
8.DC.15KunatiteCuFe23+(PO4)2(OH)2 · 4H2O
8.DC.15UKI-2006-(PO:FeHZn)ZnFe23+(PO4)2(OH)2 · 4H2O
8.DC.15UKI-2006-(PO:AlCuFeH)Fe2+Al3(PO4)2(OH)2 · 4H2O
8.DC.17KleemaniteZnAl2(PO4)2(OH)2 · 3H2O
8.DC.20BermaniteMn2+Mn23+(PO4)2(OH)2 · 4H2O
8.DC.20CoralloiteMn2+Mn23+(AsO4)2(OH)2 · 4H2O
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2O
8.DC.25FerristrunziteFe3+Fe23+(PO4)2(OH)3 · 5H2O
8.DC.25FerrostrunziteFe2+Fe23+(PO4)2(OH)2 · 6H2O
8.DC.25MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2O
8.DC.25MetavivianiteFe2+Fe23+(PO4)2(OH)2 · 6H2O
8.DC.25StrunziteMn2+Fe23+(PO4)2(OH)2 · 6H2O
8.DC.27BerauniteFe2+Fe53+(PO4)4(OH)5 · 6H2O
8.DC.30GordoniteMgAl2(PO4)2(OH)2 · 8H2O
8.DC.30LaueiteMn2+Fe23+(PO4)2(OH)2 · 8H2O
8.DC.30MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2O
8.DC.30ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2O
8.DC.30PseudolaueiteMn2+Fe23+(PO4)2(OH)2 · 8H2O
8.DC.30SigloiteFe3+Al2(PO4)2(OH)3 · 7H2O
8.DC.30StewartiteMn2+Fe23+(PO4)2(OH)2 · 8H2O
8.DC.30UshkoviteMgFe23+(PO4)2(OH)2 · 8H2O
8.DC.30FerrolaueiteFe2+Fe23+(PO4)2(OH)2 · 8H2O
8.DC.30Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2O
8.DC.30MaghrebiteMgAl2(AsO4)2(OH)2 · 8H2O
8.DC.30NordgauiteMnAl2(PO4)2(F,OH)2 · 5H2O
8.DC.32TinticiteFe3+5.34(PO4)3.62(VO4)0.38(OH)4 · 6.7H2O
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2O
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2O
8.DC.40CacoxeniteFe243+Al(PO4)17O6(OH)12 · 17H2O
8.DC.45Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
8.DC.45Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
8.DC.47KingiteAl3(PO4)2F2(OH) · 7H2O
8.DC.50WavelliteAl3(PO4)2(OH,F)3 · 5H2O
8.DC.50AllanpringiteFe33+(PO4)2(OH)3 · 5H2O
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2O
8.DC.55MapimiteZn2Fe33+(AsO4)3(OH)4 · 10H2O
8.DC.57OgdensburgiteCa2Fe43+(Zn,Mn2+)(AsO4)4(OH)6 · 6H2O
8.DC.60Nevadaite(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2O
8.DC.60Cloncurryite(Cu,VO)Al2(PO4)2(F,OH)2 · 4.5-5H2O

Other Names for Cobaltarthurite

Name in Other Languages:

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 Cobaltarthurite

Reference List:
Jambor, J. L., Vinals, J., Groat, L. A. and Raudsepp, M. (2002): Cobaltarthurite, Co2+Fe3+2(AsO4)2(OH)2.4H2O, a new member of the arthurite group. Canadian Mineralogist, 40, 725-732.

Raudsepp, M., E. Pani (2002): The crystal structure of cobaltarthurite, Co2+Fe3+2(AsO4)2(OH)2*4H2O, a Rietveld refinement. Can. Mineral. 40, 733-737.

Kampf, A.R. (2005): The crystal structure of cobaltarthurite from the Bou Azzer District, Morocco: the location of hydrogen atoms in the arthurite structure-type. Canadian Mineralogist, 43, 1387-1391.

Internet Links for Cobaltarthurite

Localities for Cobaltarthurite

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.
  • Lapland Region
    • Inari
      • Lemmenjoki
        • Miessijoki River
Tuisku, Pekka 2010. Heavy minerals from gold sluicing in Lapland Gold Rush area and their bearing on the origin of gold bearing tills. Res Terrae, Ser A, N:o 31. Proceedings of the Nordic Mineralogical Network V annual Meeting.
  • Souss-Massa-Draâ Region
    • Ouarzazate Province
      • Tazenakht
        • Bou Azer District (Bou Azzer District)
          • Khder
A.R. Kampf : "Cobaltarthurite from the Bou Azzer district, Morocco", 5th International Conference "Mineralogy & Museums", Paris, Sept. 5-8th 2004, Bull. de Liaison de la Soc. Franç. de Minéralogie et Cristallographie, 2004, Vol 16, N°2.; Georges Favreau collection - 2007
          • Oumlil
A.R. Kampf : "Cobaltarthurite from the Bou Azzer district, Morocco", 5th International Conference "Mineralogy & Museums", Paris, Sept. 5-8th 2004, Bull. de Liaison de la Soc. Franç. de Minéralogie et Cristallographie, 2004, Vol 16, N°2.
Spain (TL)
  • Murcia
    • Mazarrón-Águilas
      • Pastrana
Can Min (2002) 40 (2), 725-732; Lapis 2002(11), 29
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