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Cobaltarthurite

A valid IMA mineral species
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05686570014947357387016.jpg
Cobaltarthurite

La Reconquistada claim, Pastrana, Mazarrón, Murcia, Spain
01662680014958723666107.jpg
Cobaltarthurite

La Reconquistada claim, Pastrana, Mazarrón, Murcia, Spain
09826720015691586692807.jpg
Cobaltarthurite

La Reconquistada claim, Pastrana, Mazarrón, Murcia, Spain
05686570014947357387016.jpg
Cobaltarthurite

La Reconquistada claim, Pastrana, Mazarrón, Murcia, Spain
01662680014958723666107.jpg
Cobaltarthurite

La Reconquistada claim, Pastrana, Mazarrón, Murcia, Spain
09826720015691586692807.jpg
Cobaltarthurite

La Reconquistada claim, Pastrana, Mazarrón, Murcia, Spain
05686570014947357387016.jpg
Cobaltarthurite

La Reconquistada claim, Pastrana, Mazarrón, Murcia, Spain
01662680014958723666107.jpg
Cobaltarthurite

La Reconquistada claim, Pastrana, Mazarrón, Murcia, Spain
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About CobaltarthuriteHide

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:
Arthurite Group
Name:
Named as the cobalt analogue of arthurite.
Arthurite Group.
The cobalt analogue of arthurite.


Unique IdentifiersHide

Mindat ID:
11113
Long-form identifier:
mindat:1:1:11113:5
GUID
(UUID V4):
c798e9e9-0e33-4cc5-acad-4a23b29fd6bc

IMA Classification of CobaltarthuriteHide

Classification of CobaltarthuriteHide

Strunz-mindat (2024):
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
Dana 8th ed.:
42.11.20.5

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
CaruIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Pronunciation of CobaltarthuriteHide

Pronunciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of CobaltarthuriteHide

Lustre:
Vitreous, Silky
Transparency:
Translucent
Colour:
Yellowish brown to straw yellow
Streak:
White to pale brown
Hardness:
3½ - 4 on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
None Observed
none
Fracture:
None observed
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
Optical Extinction:
Parallel extinction and length slow. Z ≃ c.
Pleochroism:
Strong
Comments:
X = almost colorless; Z = medium yellow.
Comments:
Absorption: Z > X, Y.

Chemistry of CobaltarthuriteHide

Mindat Formula:
(Co,Mg)Fe3+2(AsO4)2(OH)2 · 4H2O
Elements listed:
As, Co, Fe, H, Mg, O - search for minerals with similar chemistry

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

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005772CobaltarthuriteRaudsepp M, Pani E (2002) The crystal structure of cobaltarthurite, CoFe2(AsO4)2(OH)2.4H2O: A Rietveld refinement The Canadian Mineralogist 40 733-73720020293
0006049CobaltarthuriteKampf A R (2005) The crystal structure of cobaltarthurite from the Bou Azzer district, Morocco: The location of hydrogen atoms in the arthurite structure-type The Canadian Mineralogist 43 1387-13912005Bou Azzer district, Morocco0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.04 Å(100)
10.2 Å(95)
4.81 Å(65)
4.24 Å(60)
2.87 Å(55)
2.89 Å(25)
4.51 Å(20)
Comments:
Dolores showing, near Pastrana, Spain. Data are from the type description.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47d : [Arsenates, antimonates, selenates, bismuthinates]

Type Occurrence of CobaltarthuriteHide

Type Locality:
ⓘ La Reconquistada claim, Pastrana, Mazarrón, Murcia, Spain
General Appearance of Type Material:
Globular and pellet-like aggregates up to 1.5 mm in diameter, consisting of radial fibers and non-fibrous material.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Ontario, Canada, NMNMC 83399.
Geological Setting of Type Material:
Oxidation zone of a presumed prior sulfide deposit.
Associated Minerals at Type Locality:
Pharmacosiderite
Reference:
Jambor, J.L., Vinals, J., Groat, L.A., Raudsepp, M. (2002) Cobaltarthurite, Co2+Fe3+2(AsO4)2(OH)2.4H2O, a new member of the arthurite group. The Canadian Mineralogist: 40: 725-732.
Download:
https://rruff.info/rruff_1.0/uploads/CM40_725.pdf

Synonyms of CobaltarthuriteHide

Other Language Names for CobaltarthuriteHide

Relationship of Cobaltarthurite to other SpeciesHide

Member of:
Arthurite Group
Other Members of this group:
ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
BendadaiteFe2+Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
KunatiteCuFe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
UKI-2006-(PO:AlCuFeH)Fe2+Al3+2(PO4)2(OH)2 · 4H2O
UM2006-27-PO:FeHZnZnFe3+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:
13 photos of Cobaltarthurite associated with ArseniosideriteCa2Fe3+3(AsO4)3O2 · 3H2O
5 photos of Cobaltarthurite associated with ArsenocrandalliteCaAl3(AsO4)(AsO3OH)(OH)6
5 photos of Cobaltarthurite associated with Barahonaite-(Fe)(Ca,Cu,Na,Fe3+,Al)12Fe3+2(AsO4)8(OH,Cl)x · nH2O
5 photos of Cobaltarthurite associated with YukoniteCa3Fe3+(AsO4)2(OH)3 · 5H2O
2 photos of Cobaltarthurite associated with OliveniteCu2(AsO4)(OH)
2 photos of Cobaltarthurite associated with ArsenogoyaziteSrAl3(AsO4)(AsO3OH)(OH)6
1 photo of Cobaltarthurite associated with Barahonaite-(Al)(Ca,Cu,Na,Fe3+,Al)12Al2(AsO4)8(OH,Cl)x · nH2O

Related Minerals - Strunz-mindat GroupingHide

8.DC.IanbruceiteZn2(AsO4)(OH) · 3H2OMon. 2/m : P21/b
8.DC.CésarferreiraiteFe2+ Fe3+2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.FerrivauxiteFe3+Al2(PO4)2(OH)3 · 5H2OTric. 1 : P1
8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2OMon. 2/m : B2/b
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. 2/m : P21/b
8.DC.15EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
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.15UM2006-27-PO:FeHZnZnFe3+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.20MagnesiobermaniteMgMn3+2(PO4)2(OH)2 · 4H2OMon. 2 : P21
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2OMon. 2/m : P21/b
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.25ZincostrunziteZnFe3+2(PO4)2(OH)2 · 6.5H2OTric. 1 : P1
8.DC.27BerauniteFe3+6(PO4)4O(OH)4 · 6H2OMon. m : Bb
8.DC.27TvrdýiteFe2+Fe3+2 Al3(PO4)4(OH)5(H2O)4 · 2H2OMon. 2/m : B2/b
8.DC.27ZincoberauniteZnFe3+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. 1 : P1
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. 1 : P1
8.DC.30StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
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.30Kayrobertsonite[MnAl2(PO4)2(OH)2(H2O)4] · 2H2OTric. 1 : P1
8.DC.30KummeriteMn2+Fe3+Al(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.32TinticiteFe3+3(PO4)2(OH)3 · 3H2OTric. 1 : P1
8.DC.32KamarizaiteFe3+3(AsO4)2(OH)3 · 3H2OTric. 1 : P1
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2OOrth.
8.DC.40CacoxeniteFe3+24AlO6(PO4)17(OH)12 · 75H2OHex. 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. 1
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.50FluorwavelliteAl3(PO4)2(OH)2F · 5H2OOrth. mmm (2/m 2/m 2/m)
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
8.DC.55MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon. m : Bm
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
8.DC.62KenngottiteMn2+3Fe3+4(PO4)4(OH)6(H2O)2 Mon. 2/m : P2/b
8.DC.67MolinelloiteCu(H2O)(OH)V4+O(V5+O4)Tric. 1 : P1
8.DC.70WhitecapsiteH16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2OHex. 6/m : P63/m
8.DC.75HeimitePbCu2(AsO4)(OH)3 · 2H2OMon. 2/m
8.DC.80LedneviteCu[PO3(OH)] · H2OMon. 2/m : P21/b

Fluorescence of CobaltarthuriteHide

In UV light:
Not fluorescent.

Other InformationHide

Notes:
Readily soluble in 1:1 HCl, which rapidly turns yellowish.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for CobaltarthuriteHide

References 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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Brazil
 
  • Pará
    • Marabá
deMelo et al. (2017)
Finland
 
  • Lapland
    • Enontekiö
      • Miessijoki River
Tuisku
Italy
 
  • Sardinia
    • South Sardinia Province
      • Gonnosfanadiga
        • Fenugu Sibiri Mine
Caboni et al. (2018)
Morocco
 
  • Drâa-Tafilalet Region
    • Ouarzazate Province
      • Amerzgane Cercle
        • Ouisselsate Caïdat
Georges Favreau collection - 2007. +1 other reference
    • Zagora Province
      • Agdz Cercle
        • Tansifte Caïdat
          • Oumlil
Kampf (2004)
Spain (TL)
 
  • Murcia
    • Mazarrón
      • Pastrana
Lapis 2002 (11) +1 other reference
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