Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Mineral Chatroom The Mindat Store

Bobkingite

This page is currently not sponsored. Click here to sponsor this page.
Big Photo

Cerro Minado, Huercal-Overa, Almería, Andalusia, Spain
© JM. Johannet

Show Bobkingite Photos (5)



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

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
 
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

Search Engines:
  • Look for Bobkingite on Google
  • Look for Bobkingite images on Google
    • External Links:
  • Look for Bobkingite on Webmineral
  • Look for Bobkingite on Athena Mineralogy
  • Look for Bobkingite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
  • webminerals
  • Search for - Bobkingite - on e-Rocks Mineral Sales & Auctions
  • Wilensky Fine Minerals
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Search for Bobkingite from all mineral dealers at minfind.com
  • Fine Minerals from Weinrich Minerals, Inc.
  • Search for minerals at Heliodor
  • Find Bobkingite on www.crystalclassics.co.uk
  • Pricedownminerals.com - Reverse Auctions and Shop
  • High-end worldwide specimens & outstanding customer service
  • Rare and Unusual minerals at Mineralogical Research Company
  • Visit the Pueblo Gem and Mineral show, Tucson 2012
    • Jobs:
  • Mining & Geology Jobs

    • 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.
    Spain
     
    • Andalusia
      • Almería
        • Huercal-Overa
    		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
    Mineral and/or Locality
    Search Google
     
    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 20th Jun 2011 08:23:45
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds