Gillardite Mineral Data

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General Gillardite Information

Chemical Formula:

Cu3NiCl2(OH)6

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

Empirical Formula:

Cu_3.08Ni_0.9Co_0.01Fe²⁺_0.004Cl₂(OH)₆

Environment:

Found in a silicified ferruginous gossan. Ni analog of herbertsmithite. Atacamite group.

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

132 North deposit, Widgiemooltha, Western Australia, Australia Link to MinDat.org Location Data.

Name Origin:

Named for Professor D. Gillard, in recognition of his contributions to the field of inorganic chemistry.

Synonym:

IMA2006-041

Gillardite Image

Images:

Gillardite

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.
© Minservice

Gillardite Crystallography

Axial Ratios:

a:c = 1:2.02532

Cell Dimensions:

a = 6.8364, c = 13.8459, Z = 3; V = 560.41 Den(Calc)= 3.76

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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),

Crystal Structure:

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Clissold M E , Leverett P , Williams P A , Hibbs D E , Nickel E H , The Canadian Mineralogist , 45 (2007) p.317-320, The structure of gillardite, the Ni-analogue of herbertsmithite, from, Widgiemooltha, Western Australia, Locality: 132N deposit, Widgiemooltha, Australia

Physical Properties of Gillardite

Cleavage:

{101} Good

Color:

Dark green.

Diaphaneity:

Transparent

Fracture:

Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Triangular Crystals - Occurs as triangular shaped crystals.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

green

Optical Properties of Gillardite

Gladstone-Dale:

CI calc= 0.099 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2226,KC= 0.2471
Ncalc = 1.93

Optical Data:

Biaxial (+), a=1.836, b=1.838,

Calculated Properties of Gillardite

Electron Density:

Bulk Density (Electron Density)=3.61 gm/cc
note: Specific Gravity of Gillardite =3.76 gm/cc.

Fermion Index:

Fermion Index = 0.0015392622
Boson Index = 0.9984607378

Photoelectric:

PE_Gillardite= 26.58 barns/electron
U=PE_Gillardite x rElectron Density= 96.03 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gillardite is Not Radioactive

Gillardite Classification

Dana Class:

10.01.01.03 (10)Oxyhalides and Hydroxyhalides

(10.01)where (A)2 (O,OH)3 Xq

(10.01.01)Atacamite group

10.01.01.01 Atacamite Cu2Cl(OH)3 Pmcn 2/m 2/m 2/m

10.01.01.02 Hibbingite (Fe,Mg)2(OH)3Cl Pnam 2/m 2/m 2/m

10.01.01.03 Gillardite! Cu3NiCl2(OH)6 R 3m 3

10.01.01.04 Haydeeite! Cu3Mg(OH)6Cl2 R 3m 3

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

References:

NAME( AmMin v93:252) PHYS. PROP.(AmMin v93:252, en.scientificcommons.org) OPTIC PROP.(en.scientificcommons.org)

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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Print or Cut-and-Paste your Gillardite Specimen Label here :

Gillardite

Cu3NiCl2(OH)6
Dana No: 10.01.01.03 Strunz No: 03.DA.10c
Locality:

Notes: