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Bobkingite

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La Cena del Depósito concession, Cerro Minado Mines, Cuesta Alta, Huércal-Overa, Almería, Andalusia, Spain
© JM. Johannet

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Formula:
Cu
 
5
Cl
 
2
(OH)
 
8
 · 2H
 
2
O
System:MonoclinicColour:Soft pale blue
Hardness:3
Name:Robert King (b. 1923), 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

IMA status:Approved 2000
Strunz 8th edition ID:3/D.01-90
Nickel-Strunz 10th (pending) edition ID:3.DA.50

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

Type Locality:New Cliffe Hill Quarry, Stanton under Bardon, Leicestershire, England, UK
General Appearance of Type Material:Parallel growths of thin platy crystals to 0.2mm across and less than 5µm thick.
Year of Discovery:2000
Geological Setting of type material:In veins in diorite.
Associated Minerals at type locality:
MalachiteCupriteCopperAzurite

Physical Properties of Bobkingite

Lustre: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 (calculated):3.25 g/cm3

Crystallography of Bobkingite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m {B1 1 2/m} {C2/m} {C1 2/m 1}
Space Group Setting:C2/m
Cell Parameters:a = 10.301Å, b = 6.758Å, c = 8.835Å
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:
d-spacingIntensity
8.199 (100)
5.502 (100)
5.029 (40)
2.883 (80)
2.693 (40)
2.263 (40)
_403)(
2.188 (50)
1.767 (40)

Optical Data of Bobkingite

Type:Biaxial (-)
RI values: nα = 1.724 nβ = 1.745 nγ = 1.750
2V:Measured: 33° , Calculated: 52°
Maximum Birefringence:δ = 0.026

Chart 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:
Cu
 
5
Cl
 
2
(OH)
 
8
 · 2H
 
2
O
Essential elements:Cl, Cu, H, O
All elements listed in formula:Cl, Cu, H, O
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.%
Empirical Formula:
Cu
 
4.99
Cl
 
2.02
(OH)
 
8.00
(H
 
2
O)
 
2.00

Relationship of Bobkingite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.DA.05Melanothallite
Cu
 
2
Cl
 
2
O
3.DA.10aAtacamite
Cu
 
2
(OH)
 
3
Cl
3.DA.10bBotallackite
Cu
 
2
(OH)
 
3
Cl
3.DA.10bClinoatacamite
Cu
 
2
(OH)
 
3
Cl
3.DA.10aHibbingite
Fe
2+
2
(OH)
 
3
Cl
3.DA.10aKempite
Mn
2+
2
(OH)
 
3
Cl
3.DA.10cParatacamite
Cu
 
3
(Cu,Zn)(OH)
 
6
Cl
 
2
3.DA.10bBelloite
Cu(OH)Cl
3.DA.10cHerbertsmithite
Cu
 
3
Zn(OH)
 
6
Cl
 
2
3.DA.10cKapellasite
Cu
 
3
Zn(OH)
 
6
Cl
 
2
3.DA.10cGillardite
Cu
 
3
Ni(OH)
 
6
Cl
 
2
3.DA.10cHaydeeite
Cu
 
3
Mg(OH)
 
6
Cl
 
2
3.DA.10dAnatacamite
Cu
 
2
Cl(OH)
 
3
3.DA.15Claringbullite
Cu
 
4
(OH)
 
7
Cl · nH
 
2
O
3.DA.15Barlowite
Cu
 
4
BrF(OH)
 
6
3.DA.20Simonkolleite
Zn
 
5
Cl
 
2
(OH)
 
8
 · H
 
2
O
3.DA.25Buttgenbachite
Cu
 
19
(NO
 
3
)
 
2
(OH)
 
32
Cl
 
4
 · 2H
 
2
O
3.DA.25Connellite
Cu
 
19
(SO
 
4
)(OH)
 
32
Cl
 
4
 · 3H
 
2
O
3.DA.30Abhurite
Sn
 
21
Cl
 
16
(OH)
 
14
O
 
6
3.DA.35Ponomarevite
K
 
4
Cu
 
4
Cl
 
10
O
3.DA.40Anthonyite
Cu(OH,Cl)
 
2
 · 3H
 
2
O
3.DA.40Calumetite
Cu(OH,Cl)
 
2
 · 2H
 
2
O
3.DA.45Khaidarkanite
Na
 
0.34
Cu
 
4
Al
 
3
(OH)
 
14
F
 
3
 · 2H
 
2
O
3.DA.55Avdoninite
K
 
2
Cu
 
5
(OH)
 
4
Cl
 
8
 · H
 
2
O
3.DA.60Droninoite
Ni
 
6
Fe
32+
(
OH)
 
16
Cl
 
2
 · 4H
 
2
O

Other Names for Bobkingite

Synonyms:
IMA2000-029
Other Languages:
German:Bobkingit
Spanish:Bobkingita

Other Information

Health Warning: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

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    • Localities for Bobkingite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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 (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
        • Lavrion District Mines
          • Sounion area
            • Sounion Mines
    		Branko Rieck collection
    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).; 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
     
    • England
      • Leicestershire
        • Stanton under Bardon
    		Mineral Mag. 66, 301-311
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