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Gillardite Mineral Data

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General Gillardite Information

Help on Chemical  Formula: Chemical Formula: Cu3NiCl2(OH)6
Help on Composition: Composition: Molecular Weight = 422.66 gm
   Iron       0.05 %  Fe    0.07 % FeO
   Cobalt     0.17 %  Co    0.21 % CoO
   Copper    46.32 %  Cu   52.15 % Cu2O
   Nickel    12.54 %  Ni   15.96 % NiO
   Hydrogen   1.43 %  H    12.79 % H2O
   Chlorine  16.78 %  Cl   16.78 % Cl
               -   %   Cl   -3.79 % -O=Cl2   
   Oxygen    22.71 %  O
            ______        ______ 
            100.00 %       94.17 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu3.08Ni0.9Co0.01Fe2+0.004Cl2(OH)6
Help on Environment: Environment: Found in a silicified ferruginous gossan. Ni analog of herbertsmithite. Atacamite group.
Help on IMA Status: IMA Status: Approved IMA 2006 (Dana # Added)
Help on Locality: Locality: 132 North deposit, Widgiemooltha, Western Australia, Australia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Professor D. Gillard, in recognition of his contributions to the field of inorganic chemistry.
Help on Synonym: Synonym: IMA2006-041

Gillardite Image

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Comments: Dark green druze of gillardite and lighter green gasphite in a complex gossenous matrix.
Location: 132 North Mine, Widgiemooltha, Western Australia, Australia. Scale: Specimen Size 3.6 x 1.7 x 2.6 cm.
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Gillardite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.02532
Help on Cell Dimensions: Cell Dimensions: a = 6.8364, c = 13.8459, Z = 3; V = 560.41 Den(Calc)= 3.76
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.463(1), 2.755(0.69), 2.257(0.39),2.903(0.19), 4.651(0.16), 2.728(0.14), 1.82(0.13), 4.519(0.11),

Physical Properties of Gillardite

Help on Cleavage: Cleavage: {101} Good
Help on Color: Color: Dark green.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Triangular Crystals - Occurs as triangular shaped crystals.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: green

Optical Properties of Gillardite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.099 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2226,KC= 0.2471
Ncalc = 1.93
Help on Optical Data: Optical Data: Biaxial (+), a=1.836, b=1.838,

Calculated Properties of Gillardite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.61 gm/cc
note: Specific Gravity of Gillardite =3.76 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0015392622
Boson Index = 0.9984607378
Help on Photoelectric: Photoelectric: PEGillardite = 26.58 barns/electron
U=PEGillardite x rElectron Density= 96.03 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gillardite is Not Radioactive

Gillardite Classification

Help on  Dana Class: Dana Class: (10)Oxyhalides and Hydroxyhalides
  (10.01)where (A)2 (O,OH)3 Xq
  (10.01.01)Atacamite group Atacamite Cu2Cl(OH)3 Pmcn 2/m 2/m 2/m Hibbingite (Fe,Mg)2(OH)3Cl Pnam 2/m 2/m 2/m Gillardite! Cu3NiCl2(OH)6 R 3m 3 Haydeeite! Cu3Mg(OH)6Cl2 R 3m 3
Help on  Strunz Class: Strunz Class: 03.DA.10c 03 - HALIDES
  03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
  03.DA -With Cu, etc., without Pb
03.DA.10c Paratacamite (Cu,Zn)2(OH)3Cl R 3 3
03.DA.10c Gillardite! Cu3NiCl2(OH)6 R 3m 3
03.DA.10c Herbertsmithite! Cu3Zn(OH)6Cl2 R 3m 3 2/m
03.DA.10c Kapellasite! Cu3Zn(OH)6Cl2 P 3m1 3 2/m
03.DA.10c Haydeeite! Cu3Mg(OH)6Cl2 R 3m 3

Other Gillardite Information

Help on References: References: NAME( AmMin v93:252) PHYS. PROP.(AmMin v93:252, en.scientificcommons.org) OPTIC PROP.(en.scientificcommons.org)
Help on See Also: See Also: Links to other databases for Gillardite :
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: 03.DA.10c





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