Bobkingite
A valid IMA mineral species
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About Bobkingite
Formula:
Cu5Cl2(OH)8 · 2H2O
Colour:
Soft pale blue
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
3.25 (Calculated)
Crystal System:
Monoclinic
Name:
Robert J. King (1923-2013), formerly at the Department of Geology, Leicester University, and a founding member of the Russell Society.
This page provides mineralogical data about Bobkingite.
Unique Identifiers
Mindat ID:
11338
Long-form identifier:
mindat:1:1:11338:2
GUID
(UUID V4):
(UUID V4):
618f1782-6eda-4b46-8e2f-9a8956da37b0
IMA Classification of Bobkingite
Classification of Bobkingite
3.DA.50
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
A : With Cu, etc., without Pb
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
A : With Cu, etc., without Pb
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Bkg | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Bobkingite
Pronunciation:
Play | Recorded by | Country |
---|---|---|
Jolyon Ralph | United Kingdom |
Physical Properties of Bobkingite
Vitreous
Transparency:
Transparent
Colour:
Soft pale blue
Streak:
Pale blue
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001} perfect and {100} fair
{001} perfect and {100} fair
Fracture:
Conchoidal
Density:
3.25 g/cm3 (Calculated)
Optical Data of Bobkingite
Type:
Biaxial (-)
RI values:
nα = 1.724 nβ = 1.745 nγ = 1.750
2V:
Measured: 33° , Calculated: 52°
Max Birefringence:
δ = 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
Not mentioned
Optical Extinction:
X ∧ a = 22° in obtuse angle β; Y ≈ c; Z = b.
Pleochroism:
Visible
Comments:
X = Very pale blue; Z = Pale greenish blue
Chemistry of Bobkingite
Mindat Formula:
Cu5Cl2(OH)8 · 2H2O
Elements listed:
Crystallography of Bobkingite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 10.301 Å, b = 6.758 Å, c = 8.835 Å
β = 111.53°
β = 111.53°
Ratio:
a:b:c = 1.524 : 1 : 1.307
Unit Cell V:
572.1 ų
Z:
2
Morphology:
{001} dominant with {100} and {110} minor.
Twinning:
None mentioned.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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CIF File Best | x | y | z | a | b | c
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0018486 | Bobkingite | Hawthorne F C, Cooper M A, Grice J D, Roberts A C, Hubbard N (2002) Description and crystal structure of bobkingite, (Cu2+)5Cl2(OH)8(H2O)2, a new mineral from New Cliffe Hill Quarry, Stanton-under-Bardon, Leicestershire, UK Mineralogical Magazine 66 301-311 | 2002 | New Cliffe Hill Quarry, Stanton-under-Bardon, Leicestershire, UK | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
8.199 Å | (100) |
5.502 Å | (100) |
5.029 Å | (40) |
2.883 Å | (80) |
2.693 Å | (40) |
2.263 Å | (40) |
2.188 Å | (50) |
1.767 Å | (40) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Bobkingite
General Appearance of Type Material:
Parallel growths of thin platy crystals to 0.2 mm across and less than 5 µm thick.
Place of Conservation of Type Material:
Canadian Museum of Nature (CMNNG 83270) and the X-ray Diffraction Laboratory at the Geological Survey of Canada, Ottawa, Ontario, Canada.
Geological Setting of Type Material:
In veins in diorite.
Associated Minerals at Type Locality:
Synonyms of Bobkingite
Other Language Names for Bobkingite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
3.DA. | Centennialite | CaCu3Cl2(OH)6 · nH2O (n ~ 0.7) |
3.DA. | Muonionalustaite | Ni3(OH)4Cl2 · 4H2O |
3.DA. | Parahibbingite | Fe2(OH)3Cl |
3.DA. | Bounahasite | Cu+Cu2+2(OH)3Cl2 |
3.DA.05 | Melanothallite | Cu2Cl2O |
3.DA.10a | Atacamite | Cu2(OH)3Cl |
3.DA.10b | Botallackite | Cu2(OH)3Cl |
3.DA.10b | Clinoatacamite | Cu2(OH)3Cl |
3.DA.10a | Hibbingite | Fe2+2(OH)3Cl |
3.DA.10a | Kempite | Mn2+2(OH)3Cl |
3.DA.10c | Kuliginite | Fe3Mg(OH)6Cl2 |
3.DA.10c | Paratacamite | Cu3(Cu,Zn)(OH)6Cl2 |
3.DA.10b | Belloite | Cu(OH)Cl |
3.DA.10c | Herbertsmithite | Cu3Zn(OH)6Cl2 |
3.DA.10c | Kapellasite | Cu3Zn(OH)6Cl2 |
3.DA.10c | Gillardite | Cu3Ni(OH)6Cl2 |
3.DA.10c | Haydeeite | Cu3Mg(OH)6Cl2 |
3.DA.10c | Leverettite | Cu3Co(OH)6Cl2 |
3.DA.10c | Paratacamite-(Ni) | Cu3(Ni,Cu)(OH)6Cl2 |
3.DA.10c | Tondiite | Cu3Mg(OH)6Cl2 |
3.DA.10c | Misakiite | Cu3Mn(OH)6Cl2 |
3.DA.10b | Iyoite | MnCuCl(OH)3 |
3.DA.10b | Unnamed (Cu-Zn Chloride Hydroxide) | CuZnCl(OH)3 |
3.DA.15 | Claringbullite | Cu4ClF(OH)6 |
3.DA.15 | Barlowite | Cu4BrF(OH)6 |
3.DA.20 | Simonkolleite | Zn5Cl2(OH)8 · H2O |
3.DA.25 | Buttgenbachite | Cu19(NO3)2(OH)32Cl4 · 2H2O |
3.DA.25 | Connellite | Cu19(SO4)(OH)32Cl4 · 3H2O |
3.DA.30 | Abhurite | Sn21Cl16(OH)14O6 |
3.DA.35 | Ponomarevite | K4Cu4Cl10O |
3.DA.40 | Anthonyite | Cu(OH,Cl)2 · 3H2O |
3.DA.40 | Calumetite | CaCu4(OH)8Cl2 · 3.5H2O |
3.DA.45 | Khaidarkanite | Cu4Al3(OH)14F3 · 2H2O |
3.DA.55 | Avdoninite | K2Cu5(OH)4Cl8 · H2O |
3.DA.60 | Droninoite | Ni6Fe3+2(OH)16Cl2 · 4H2O |
3.DA.70 | Chrysothallite | K6Cu6Tl3+Cl17(OH)4 · H2O |
3.DA.70 | Dioskouriite | CaCu4Cl6(OH)4 · 4H2O |
3.DA.75 | Feodosiyite | Cu11Mg2Cl18(OH)8 · 16H2O |
3.DA.80 | Romanorlovite | K8Cu6Cl17(OH)3 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Bobkingite
mindat.org URL:
https://www.mindat.org/min-11338.html
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References for Bobkingite
Reference List:
Hawthorne, F. C., Cooper, M. A., Grice, J. D., Roberts, A. C., Hubbard, N. (2002) Description and crystal structure of bobkingite, Cu2+5Cl2(OH)8(H2O)2, a new mineral from New Cliffe Hill Quarry, Stanton-under-Bardon, Leicestershire, UK. Mineralogical Magazine, 66 (2) 301-311 doi:10.1180/0026461026620030
Localities for Bobkingite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Greece | |
| Kolitsch et al. (2014) |
Spain | |
| in Spanish version (Revista de Minerales) +1 other reference |
UK (TL) | |
| Hawthorne et al. (2002) |
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Sounion Mine No. 19, Cato Sounio mines, Sounion, Lavrion mining district, Lavreotiki, East Attica, Attica, Greece