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Cobaltarthurite Mineral Data

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General Cobaltarthurite Information

Help on Chemical  Formula: Chemical Formula: CoFe+++2(AsO4)2(OH)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 533.48 gm
   Magnesium   0.46 %  Mg    0.76 % MgO
   Manganese   1.03 %  Mn    1.33 % MnO
   Iron       21.98 %  Fe   31.43 % Fe2O3
   Cobalt      5.52 %  Co    7.02 % CoO
   Arsenic    28.09 %  As   43.08 % As2O5
   Hydrogen    1.83 %  H    16.38 % H2O
   Oxygen     41.09 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Co0.5Mg0.1Fe3+0.1Mn2+0.1Fe3+2(AsO4)2(OH)1.7�4(H2O)
Help on Environment: Environment: Secondary mineral in a near surface, sulfide-depleted lens (Dolores showing). (Co-dominant analogue of arthurite; structure)
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Patrana (a village about 10 km east of Mazzarron), Province of Murcia, SE Spain. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the Co-dominant member of the arthurite group.
Help on Synonym: Synonym: IMA2001-052

Cobaltarthurite Image

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  Cobaltarthurite   Arseniosiderite

Comments: Olive-greenish crystalline druse of cobaltarthurite with spherical arseniosiderite.
Location: Pastrana, Mazarrón, Murcia, Spain. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Cobaltarthurite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0577:1:0.5741
Help on Cell Dimensions: Cell Dimensions: a = 10.2635, b = 9.7028, c = 5.5711, Z = 2; beta = 94.207° V = 553.30 Den(Calc)= 3.20
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.04(1)(110), 10.2(0.95)(100), 4.81(0.65)(001),3.05(0.6), 4.24(0.6)(111), 2.87(0.55)(311), 2.89(0.25)(221), 4.51(0.2),

Physical Properties of Cobaltarthurite

Help on Cleavage: Cleavage: None
Help on Color: Color: Straw yellow, Dark brown.
Help on Density: Density: 3.22
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Oolitic - < 3mm rounded spherical grains.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: light brownish white

Optical Properties of Cobaltarthurite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2396,KPDmeas= 0.2381,KC= 0.2412
Ncalc = 1.77 - 1.78
Help on Optical Data: Optical Data: Biaxial (+), a=1.741, b=1.762, g=1.797, bire=0.0560

Calculated Properties of Cobaltarthurite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.08 gm/cc
note: Specific Gravity of Cobaltarthurite =3.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0053160916
Boson Index = 0.9946839084
Help on Photoelectric: Photoelectric: PECobaltarthurite = 27.71 barns/electron
U=PECobaltarthurite x rElectron Density= 85.48 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cobaltarthurite is Not Radioactive

Cobaltarthurite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.18)Whitmoreite Group Whitmoreite FeFe2(PO4)2(OH)2•4(H2O) P 21/c 2/m Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2•4(H2O) P 21/c 2/m Ojuelaite ZnFe2(AsO4)2(OH)2•4(H2O) P 21/c 2/m Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2•4(H2O) P 21/c 2/m Gladiusite! Fe2(Fe,Mg)4(PO4)(OH)13•H2O P 21/n 2/m Cobaltarthurite! CoFe2(AsO4)2(OH)2•4(H2O) P 21/c 2/m Kunatite CuFe2(PO4)2(OH)2•4H2O P 21/c 2/m Bendadaite! FeFe2(AsO4)2(OH)2•4H2O P 21/c 2/m
Help on  Strunz Class: Strunz Class: 08.DC.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
08.DC.15 Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2•4(H2O) P 21/c 2/m
08.DC.15 Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2•4(H2O) P 21/c 2/m
08.DC.15 Ojuelaite ZnFe2(AsO4)2(OH)2•4(H2O) P 21/c 2/m
08.DC.15 Whitmoreite FeFe2(PO4)2(OH)2•4(H2O) P 21/c 2/m
08.DC.15 Cobaltarthurite! CoFe2(AsO4)2(OH)2•4(H2O) P 21/c 2/m
08.DC.15 Kunatite CuFe2(PO4)2(OH)2•4H2O P 21/c 2/m
08.DC.15 Bendadaite! FeFe2(AsO4)2(OH)2•4H2O P 21/c 2/m

Other Cobaltarthurite Information

Help on References: References: NAME( AmMin, Vol 88, p 475) PHYS. PROP.(AmMin, v88, p475; v91, p715) OPTIC PROP.(AmMin, Vol 88, p 475)
Help on See Also: See Also: Links to other databases for Cobaltarthurite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 08.DC.15





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