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Cobaltarthurite

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Formula:
(Co,Mg)Fe3+2(AsO4)2(OH)2 · 4H2O
Colour:
yellowish brown to straw yellow
Lustre:
Vitreous, Silky
Hardness:
3½ - 4
Specific Gravity:
3.22
Crystal System:
Monoclinic
Member of:
Name:
Named as the cobalt analogue of arthurite.
Arthurite Group.
The cobalt analogue of arthurite.


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Classification of CobaltarthuriteHide

Approved
Approval Year:
2001
8.DC.15

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
42.11.20.5

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O

Physical Properties of CobaltarthuriteHide

Vitreous, Silky
Transparency:
Translucent
Colour:
yellowish brown to straw yellow
Streak:
white to pale brown
Hardness:
3½ - 4 on Mohs scale
Hardness Data:
Measured
Cleavage:
None Observed
none
Density:
3.22 g/cm3 (Measured)    

Optical Data of CobaltarthuriteHide

Type:
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:
High

Chemical Properties of CobaltarthuriteHide

Formula:
(Co,Mg)Fe3+2(AsO4)2(OH)2 · 4H2O
IMA Formula:
CoFe3+2(AsO4)2(OH)2 · 4H2O

Crystallography of CobaltarthuriteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 10.27 Å, b = 9.72 Å, c = 5.545 Å
β = 94.46°
Ratio:
a:b:c = 1.057 : 1 : 0.57
Unit Cell V:
551.85 ų
Z:
2

Type Occurrence of CobaltarthuriteHide

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

Synonyms of CobaltarthuriteHide

Other Language Names for CobaltarthuriteHide

Relationship of Cobaltarthurite to other SpeciesHide

Member of:
Other Members of this group:
ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon.
BendadaiteFe2+Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon.
KunatiteCuFe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon.
UKI-2006-(PO:AlCuFeH)Fe2+Al3+2(PO4)2(OH)2 · 4H2O
UKI-2006-(PO:FeHZn)ZnFe3+2(PO4)2(OH)2 · 4H2OMon.
WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b

Common AssociatesHide

Associated Minerals Based on Photo Data:
Arseniosiderite8 photos of Cobaltarthurite associated with Arseniosiderite on mindat.org.
Olivenite2 photos of Cobaltarthurite associated with Olivenite on mindat.org.
Arsenocrandallite1 photo of Cobaltarthurite associated with Arsenocrandallite on mindat.org.
Barahonaite-(Fe)1 photo of Cobaltarthurite associated with Barahonaite-(Fe) on mindat.org.
Arsenogoyazite1 photo of Cobaltarthurite associated with Arsenogoyazite on mindat.org.
Yukonite1 photo of Cobaltarthurite associated with Yukonite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2OMon.
8.DC.07EuchroiteCu2(AsO4)(OH) · 3H2OOrth. 2 2 2 : P21 21 21
8.DC.10LegranditeZn2(AsO4)(OH) · H2OMon. 2/m : P21/b
8.DC.12StrashimiriteCu8(AsO4)4(OH)4 · 5H2OMon.
8.DC.15ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon.
8.DC.15EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon.
8.DC.15WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15BendadaiteFe2+Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15KunatiteCuFe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15UKI-2006-(PO:FeHZn)ZnFe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15UKI-2006-(PO:AlCuFeH)Fe2+Al3+2(PO4)2(OH)2 · 4H2O
8.DC.17KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.
8.DC.20BermaniteMn2+Mn3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P2/b
8.DC.20CoralloiteMn2+Mn3+2(AsO4)2(OH)2 · 4H2OTric. 1 : P1
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2OMon.
8.DC.25FerristrunziteFe3+Fe3+2(PO4)2(OH)3 · 5H2OTric.
8.DC.25FerrostrunziteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric.
8.DC.25MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.25MetavivianiteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25StrunziteMn2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.27BerauniteFe2+Fe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DC.30GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30LaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2OTric.
8.DC.30ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30PseudolaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.30SigloiteFe3+Al2(PO4)2(OH)3 · 7H2OTric.
8.DC.30StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric.
8.DC.30FerrolaueiteFe2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MaghrebiteMgAl2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30NordgauiteMnAl2(PO4)2(F,OH)2 · 5H2OTric. 1 : P1
8.DC.32TinticiteFe3+5.34(PO4)3.62(VO4)0.38(OH)4 · 6.7H2OTric. 1 : P1
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2OOrth.
8.DC.40CacoxeniteFe3+24Al(PO4)17O6(OH)12 · 17H2OHex. 6/m : P63/m
8.DC.45Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
8.DC.45Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
8.DC.47KingiteAl3(PO4)2F2(OH) · 7H2OTric.
8.DC.50WavelliteAl3(PO4)2(OH,F)3 · 5H2OOrth. mmm (2/m 2/m 2/m)
8.DC.50AllanpringiteFe3+3(PO4)2(OH)3 · 5H2OMon. 2/m : P21/m
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
8.DC.55MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon.
8.DC.57OgdensburgiteCa2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
8.DC.60Nevadaite(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2OOrth. mmm (2/m 2/m 2/m)
8.DC.60CloncurryiteCu0.5(VO)0.5Al2(PO4)2F2 · 5H2OMon. 2/m : P21/b

Related Minerals - Dana Grouping (8th Ed.)Hide

42.11.20.1WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
42.11.20.2ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon.
42.11.20.3OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon.
42.11.20.4EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon.
42.11.20.6BendadaiteFe2+Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
42.11.20.7KunatiteCuFe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
42.11.20.8UKI-2006-(PO:FeHZn)ZnFe3+2(PO4)2(OH)2 · 4H2OMon.
42.11.20.9UKI-2006-(PO:AlCuFeH)Fe2+Al3+2(PO4)2(OH)2 · 4H2O

Other InformationHide

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 CobaltarthuriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 CobaltarthuriteHide

Localities for CobaltarthuriteHide

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.
Finland
 
  • 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.
Morocco
 
  • Drâa-Tafilalet Region
    • Ouarzazate Province
      • Tazenakht
        • Bou Azzer District (Bou Azer 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
      • Pastrana
Can Min (2002) 40 (2), 725-732; Lapis 2002(11), 29
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