Bobkingite Mineral Data

Bobkingite Mineral Data

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General Bobkingite Information

Chemical Formula:

Cu5Cl2(OH)8(H2O)2

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

Empirical Formula:

Cu₅Cl₂(OH)₈·2(H₂O)

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

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

New Cliffe Hill Quarry, Stanton-under-Bardon, Leicestershire, England. Link to MinDat.org Location Data.

Name Origin:

Named for Robert King, formerly of the Department of Geology, Leicester University, prominent mineral collector and founding member of the Russell Society.

Synonym:

IMA2000-029

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Bobkingite Crystallography

Axial Ratios:

a:b:c =1.5242:1:1.3073

Cell Dimensions:

a = 10.301, b = 6.758, c = 8.835, Z = 2; beta = 111.53° V = 572.13 Den(Calc)= 3.25

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 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

Cleavage:

[001] Perfect, [100] Fair

Color:

Pale blue.

Diaphaniety:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

pale blue

Optical Properties of Bobkingite

Gladstone-Dale:

CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2276,KC= 0.2261

Optical Data:

Biaxial (-), a=1.724, b=1.745, g=1.75, bire=0.0260

Calculated Properties of Bobkingite

Electron Density:

r_electron=3.14 gm/cc
note: r_Bobkingite=3.25 gm/cc.

Fermion Index

Fermion Index = 0.00014
Boson Index = 0.99986

Photoelectric:

PE_Bobkingite= 25.58 barns/electron
U=PE_Bobkingite x r_electron= 80.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bobkingite is Not Radioactive

Bobkingite Classification

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

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

References:

NAME( AmMin, Vol 88, p 251) PHYS. PROP.(AmMin, Vol 88, p 251) OPTIC PROP.(AmMin, Vol 88, p 251)

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

Bobkingite

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

Notes: