Gillardite Mineral Data

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Gillardite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Gillardite :

A Bijoux Google Search for Gillardite
Adam's Minerals Google Search for Gillardite
Cape Minerals Google Search for Gillardite
Dakota Matrix Minerals Google Search for Gillardite
Excalibur Mineral Corp. Google Search for Gillardite
Exceptional Minerals Google Search for Gillardite
John Betts Fine Minerals Search for Gillardite
McDougall Minerals Google Search for Gillardite
Mineral News Website Link
Rock and Mineral Shows Google Search for Gillardite
Weinrich Minerals, Inc. Google Search for Gillardite

Ask about Gillardite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: