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Bobkingite

Formula:
Cu
 
5
[(OH)
 
8
|Cl
 
2
] · 2H
 
2
O
System:MonoclinicColour:Soft pale blue
Hardness:3
Name:For Bob King
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}
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)

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
[(OH)
 
8
|Cl
 
2
] · 2H
 
2
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
[O|Cl
 
2
]
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)
 
3
|Cl]
 
2
3.DA.10bBelloite
Cu[OH|Cl]
3.DA.10cHerbertsmithite
Cu
 
3
Zn[(OH)
 
3
|Cl]
 
2
3.DA.10cKapellasite
Cu
 
3
Zn[(OH)
 
3
|Cl]
 
2
3.DA.10cGillardite
Cu
 
3
NiCl
 
2
(OH)
 
6
3.DA.10cHaydeeite
Cu
 
3
Mg(OH)
 
6
Cl
 
2
3.DA.10dIMA2009-042
Cu
 
2
Cl(OH)
 
3
3.DA.15Claringbullite
Cu
 
4
[(OH)
 
7
|Cl] · nH
 
2
O
3.DA.20Simonkolleite
Zn
 
5
[(OH)
 
8
|Cl
 
2
] · H
 
2
O
3.DA.25Buttgenbachite
Cu
 
19
[(OH)
 
32
|(NO
 
3
)
 
2
|Cl
 
4
] · 2H
 
2
O
3.DA.25Connellite
Cu
 
19
[(OH)
 
32
|SO
 
4
|Cl
 
4
] · 3H
 
2
O
3.DA.30Abhurite
Sn
 
21
Cl
 
16
(OH)
 
14
O
 
6
3.DA.35Ponomarevite
K
 
4
Cu
 
4
[O|Cl
 
10
]
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
 
3
Fe
3+
 
Cl(OH)
 
8
·2H
 
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

    (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.
    UK
     
    • England
      • Leicestershire
        • Stanton under Bardon
    		Mineral Mag. 66, 301-311
    Mineral and/or Locality
    Google
     
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