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Bobkingite Mineral Data

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General Bobkingite Information

Help on Chemical  Formula: Chemical Formula: Cu5Cl2(OH)8(H2O)2
Help on Composition: Composition: Molecular Weight = 560.72 gm
   Copper    56.66 %  Cu   70.93 % CuO
   Hydrogen   2.16 %  H    19.28 % H2O
   Chlorine  12.65 %  Cl   12.65 % Cl
               -   %   Cl   -2.85 % -O=Cl2   
   Oxygen    28.53 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu5Cl2(OH)8•2(H2O)
Help on Environment: Environment: Occurs on crusts of malachite and azurite that overlie massive cuprite in oxidized waste material consisting of quarried diorite with copper inclusions. Similar to atacamite; struct ure
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: New Cliffe Hill Quarry, Stanton-under-Bardon, Leicestershire, England. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Robert King, formerly of the Department of Geology, Leicester University, prominent mineral collector and founding member of the Russell Society.
Help on Synonym: Synonym: IMA2000-029

Bobkingite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5242:1:1.3073
Help on Cell Dimensions: Cell Dimensions: a = 10.301, b = 6.758, c = 8.835, Z = 2; beta = 111.53° V = 572.13 Den(Calc)= 3.25
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.502(1)(110), 8.199(1)(001), 2.883(0.8)(310),2.188(0.5)(232), 1.767(0.4), 2.263(0.4), 2.693(0.4), 5.03(0.4),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 0) ( 1 0 0) ( 0 0 1)

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Physical Properties of Bobkingite

Help on Cleavage: Cleavage: {001} Perfect, {100} Fair
Help on Color: Color: Pale blue.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: pale blue

Optical Properties of Bobkingite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2276,KC= 0.2261
Ncalc = 1.73
Help on Optical Data: Optical Data: Biaxial (-), a=1.724, b=1.745, g=1.75, bire=0.0260

Calculated Properties of Bobkingite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.14 gm/cc
note: Specific Gravity of Bobkingite =3.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001401961
Boson Index = 0.9998598039
Help on Photoelectric: Photoelectric: PEBobkingite = 25.58 barns/electron
U=PEBobkingite x rElectron Density= 80.35 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bobkingite is Not Radioactive

Bobkingite Classification

Help on  Dana Class: Dana Class: (10)Oxyhalides and Hydroxyhalides
  (10.05)where Am (O,OH)p Xq
  (10.05.08)Dana Group Simonkolleite Zn5(OH)8Cl2•(H2O) R 3m 3 2/m Bobkingite! Cu5Cl2(OH)8(H2O)2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 03.DA.50 03 - HALIDES
  03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
  03.DA -With Cu, etc., without Pb
03.DA.50 Bobkingite! Cu5Cl2(OH)8(H2O)2 C 2/m 2/m

Other Bobkingite Information

Help on References: References: NAME( AmMin, Vol 88, p 251) PHYS. PROP.(AmMin, Vol 88, p 251) OPTIC PROP.(AmMin, Vol 88, p 251)
Help on See Also: See Also: Links to other databases for Bobkingite :
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.50





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