Classification of Bobkingite |
| IMA status: | Approved 2000 |
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| Strunz 8th edition ID: | 3/D.01-90
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| 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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| mindat.org URL: | http://www.mindat.org/min-11338.html Please feel free to link to this page. |
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Type Occurrence of Bobkingite |
| Type Locality: | New Cliffe Hill Quarry, Stanton under Bardon, Leicestershire, England, UK |
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| General Appearance of Type Material: | Parallel growths of thin platy crystals to 0.2mm across and less than 5µm thick. |
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| Year of Discovery: | 2000 |
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| Geological Setting of type material: | In veins in diorite. |
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| Associated Minerals at type locality: | |
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Physical Properties of Bobkingite |
| Lustre: | Vitreous |
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| Diaphaneity (Transparency): | Transparent |
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| Colour: | Soft pale blue |
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| Streak: | Pale blue |
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| Hardness (Mohs): | 3 |
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| Tenacity: | Brittle |
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| Cleavage: | Perfect {001} perfect and {100} fair |
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| Fracture: | Conchoidal |
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| Density (calculated): | 3.25 g/cm3 |
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Crystallography of Bobkingite |
| Crystal System: | Monoclinic |
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| Class (H-M): | 2/m - Prismatic |
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| Space Group: | B2/m {B1 1 2/m} {C2/m} {C1 2/m 1} |
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| Cell Parameters: | a = 10.301Å, b = 6.758Å, c = 8.835Å β = 111.53° |
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| Ratio: | a:b:c = 1.524 : 1 : 1.307 |
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| Unit Cell Volume: | V 572.1 ų |
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| Z: | 2 |
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| Morphology: | {001} dominant with {100} and {110} minor |
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| Twinning: | None mentioned. |
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| X-Ray Powder Diffraction: | | d-spacing | | Intensity | | 8.199 | | (100) | | 5.502 | | (100) | | 5.029 | | (40) | | 2.883 | | (80) | | 2.693 | | (40) | | 2.263 | | (40) | | _403) | | ( | | 2.188 | | (50) |
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Optical Data of Bobkingite |
| Type: | Biaxial (-) |
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| RI values: | nα = 1.724 nβ = 1.745 nγ = 1.750 |
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| 2V: | Measured: 33° , Calculated: 52° |
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| Maximum Birefringence: | δ = 0.026
 Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. |
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| Surface Relief: | High |
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| Dispersion: | Not mentioned |
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| Pleochroism: | Visible |
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| Comments: | X = Very pale blue
Z = Pale greenish blue
X ^ a = 22° in obtuse angle β
Y ≈ c
Z = b |
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Chemical Properties of Bobkingite |
| Formula: | |
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| All elements listed in formula: | Cl, Cu, H, O |
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| 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.% |
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| Empirical Formula: | |
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Relationship of Bobkingite to other Species |
Related Minerals - Nickel-Strunz Grouping):
- + | |
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Other Names for Bobkingite |
| Synonyms: | |
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| Other Languages: | |
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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. |
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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.
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Internet Links for Bobkingite |
| Search Engines: |
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| External Links: | Look for Bobkingite on WebmineralLook for Bobkingite on Athena MineralogyLook for Bobkingite on WikipediaLook for Bobkingite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Bobkingite in the Natural History Museum (London) online catalogue |
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Localities for Bobkingite |