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Bobkingite

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Robert J. King
Formula:
Cu5Cl2(OH)8 · 2H2O
System:
Monoclinic
Colour:
Soft pale blue
Lustre:
Vitreous
Hardness:
3
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.


Classification of Bobkingite

Approved
Approval Year:
2000
3.DA.50

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
A : With Cu, etc., without Pb

Physical Properties of Bobkingite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Soft pale blue
Streak:
Pale blue
Hardness (Mohs):
3
Tenacity:
Brittle
Cleavage:
Perfect
{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.
Surface Relief:
High
Dispersion:
Not mentioned
Pleochroism:
Visible
Comments:
X = Very pale blue
Z = Pale greenish blue
X ^ a = 22° in obtuse angle β
Y ≈ c
Z = b

Chemical Properties of Bobkingite

Formula:
Cu5Cl2(OH)8 · 2H2O
IMA Formula:
Cu52+Cl2(OH)8 · 2H2O
Elements listed in formula:
Analytical Data:
Means of five sets of electron microprobe data (with H2O calculated to give 12 H)
CuO (70.46)
H2O (19.19)
Cl  (12.71)

sum: 102.36
Less O = Cl 2.87
Total (99.49) wt.%

Crystallography of Bobkingite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Space Group Setting:
C2/m
Cell Parameters:
a = 10.301 Å, b = 6.758 Å, c = 8.835 Å
β = 111.53°
Ratio:
a:b:c = 1.524 : 1 : 1.307
Unit Cell Volume:
V 572.1 ų
Z:
2
Morphology:
{001} dominant with {100} and {110} minor
Twinning:
None mentioned.
X-Ray Powder Diffraction Data:
d-spacingIntensity
8.199 (100)
5.502 (100)
5.029 (40)
2.883 (80)
2.693 (40)
2.263 (40)
2.188 (50)
1.767 (40)

Type Occurrence of Bobkingite

General Appearance of Type Material:
Parallel growths of thin platy crystals to 0.2mm across and less than 5µm thick.
Geological Setting of Type Material:
In veins in diorite.
Empirical Formula:
Cu4.99Cl2.02(OH)8.00(H2O)2.00
Associated Minerals at Type Locality:

Relationship of Bobkingite to other Species

3.DA.05MelanothalliteCu2Cl2O
3.DA.10aAtacamiteCu2(OH)3Cl
3.DA.10bBotallackiteCu2(OH)3Cl
3.DA.10bClinoatacamiteCu2(OH)3Cl
3.DA.10aHibbingiteFe22+(OH)3Cl
3.DA.10aKempiteMn22+(OH)3Cl
3.DA.10cParatacamiteCu3(Cu,Zn)(OH)6Cl2
3.DA.10bBelloiteCu(OH)Cl
3.DA.10cHerbertsmithiteCu3Zn(OH)6Cl2
3.DA.10cKapellasiteCu3Zn(OH)6Cl2
3.DA.10cGillarditeCu3Ni(OH)6Cl2
3.DA.10cHaydeeiteCu3Mg(OH)6Cl2
3.DA.15ClaringbulliteCu4ClF(OH)6
3.DA.15BarlowiteCu4BrF(OH)6
3.DA.20SimonkolleiteZn5Cl2(OH)8 · H2O
3.DA.25ButtgenbachiteCu19(NO3)2(OH)32Cl4 · 2H2O
3.DA.25ConnelliteCu19(SO4)(OH)32Cl4 · 3H2O
3.DA.30AbhuriteSn21Cl16(OH)14O6
3.DA.35PonomareviteK4Cu4Cl10O
3.DA.40AnthonyiteCu(OH,Cl)2 · 3H2O
3.DA.40CalumetiteCu(OH,Cl)2 · 2H2O
3.DA.45KhaidarkaniteNa0.34Cu4Al3(OH)14F3 · 2H2O
3.DA.55AvdoniniteK2Cu5(OH)4Cl8 · H2O
3.DA.60DroninoiteNi6Fe32+(OH)16Cl2 · 4H2O

Other Names for Bobkingite

Name in Other Languages:
German:Bobkingit
Simplified Chinese:羟氯铜石
Spanish:Bobkingita
Traditional Chinese:羥氯銅石

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.

References for Bobkingite

Reference List:
F. C. Hawthorne, M. A. Cooper, J. D. Grice, A. C. Roberts & N. Hubbard (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.

Mineralogical Record: 34: 202.

Internet Links for Bobkingite

mindat.org URL:
https://www.mindat.org/min-11338.html
Please feel free to link to this page.

Localities for Bobkingite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Sounion area
          • Sounion Mines
Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem altem Bergbau und den Schlacken von Lavrion (I). Mineralien-Welt 25 (1), 60-75 (in German).
Spain
 
  • Andalusia
    • Almería
      • Huércal-Overa
        • Cuesta Alta
          • Cerro Minado Mines
VIÑALS, J., FAVREAU, G., and EYTIER C. & J.-R. (2010): Bobkingite, capgaronnite, juanitaite, gerhardtite, reevesite and other rare minerals from Cerro Minado, Huercal-Overa (Almería). Mineral Up, 4, 3, 6-23 Versions simultaneously published in Catalan (Mineralogistes de Catalunya); in Spanish version (Revista de Minerales).
UK (TL)
 
  • England
    • Leicestershire
      • Stanton under Bardon
F. C. Hawthorne, M. A. Cooper, J. D. Grice, A. C. Roberts & N. Hubbard (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.
Mineral and/or Locality  
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