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
 

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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 - PrismaticH-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),
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Physical Properties of Bobkingite

Help on Cleavage: Cleavage: [001] Perfect, [100] Fair
Help on Color: Color: Pale blue.
Help on Diaphaniety: Diaphaniety: 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
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:

relectron=3.14 gm/cc
note: rBobkingite =3.25 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00014
Boson Index = 0.99986
Help on Photoelectric: Photoelectric:

PEBobkingite = 25.58 barns/electron
U=PEBobkingite x relectron= 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: 10.5.8.2 (10)Oxyhalides and Hydroxyhalides
  (10.5)where Am (O,OH)p Xq
  (10.5.8)Dana Group
 
10.5.8.1 Simonkolleite Zn5(OH)8Cl2·(H2O) R 3m 3 2/m
 
10.5.8.2 Bobkingite ! Cu5Cl2(OH)8(H2O)2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: III/D.01-65 III - Halogenides
  III/D - Oxi-halogenides with Mg - Mn - Cu - Zn - Sn
  III/D.01 - Atacamite series, Korshunovskite - Anthonyite
 
III/D.01-10 Korshunovskite Mg2Cl(OH)3·3.5-4(H2O) P1 or P1 Tri
 
III/D.01-12 Nepskoeite! Mg4Cl(OH)7·6(H2O) Pcmm,Pcm2,Pc2m Ortho
 
III/D.01-15 Hibbingite (Fe,Mg)2(OH)3Cl Pnam 2/m 2/m 2/m
 
III/D.01-20 Kempite Mn2Cl(OH)3 Pnam 2/m 2/m 2/m
 
III/D.01-25 Belloite! Cu(OH)Cl P 21/a 2/m
 
III/D.01-30 Atacamite Cu2Cl(OH)3 Pmcn 2/m 2/m 2/m
 
III/D.01-40 Clinoatacamite! Cu2(OH)3Cl P 21/n 2/m
 
III/D.01-50 Botallackite Cu2Cl(OH)3 P 21/m 2/m
 
III/D.01-55 Paratacamite (Cu,Zn)2(OH)3Cl R 3 3
 
III/D.01-57 Herbertsmithite! Cu3Zn(OH)6Cl2 R 3m 3 2/m
 
III/D.01-60 Melanothallite Cu2OCl2 F ddd 2/m 2/m 2/m
 
III/D.01-65 Bobkingite Cu5Cl2(OH)8(H2O)2 C 2/m 2/m
 
III/D.01-70 Calumetite Cu(OH,Cl)2·2(H2O) Unk Ortho
 
III/D.01-80 Anthonyite Cu(OH,Cl)2·3(H2O) Unk. Mono
 

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Bobkingite

Cu5Cl2(OH)8(H2O)2
Dana No: 10.5.8.2 Strunz No: III/D.01-65
Locality:

 

Notes:

 

 
   
 
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