Georgbokiite
A valid IMA mineral species
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About Georgbokiite
Georgiy B. Bokii
Formula:
Cu5(SeO3)2O2Cl2
Colour:
Chestnut-brown to dark brown.
Lustre:
Adamantine, Vitreous
Hardness:
4
Specific Gravity:
4.88 (Calculated)
Crystal System:
Monoclinic
Name:
In honour of Georgiy Borisovich Bokii (Георгий Борисович Бокий) (26 September (9 October) 1909, St. Petersburg, Russian Empire - 4 September 2000, Moscow , Russia), crystal chemist, for his contributions to crystal chemistry and mineralogy. He was the first head of the Department of Crystallography and Crystallochemistry in the Geological Faculty of Moscow State University. He also worked at the Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the USSR Academy of Sciences (IGEM).
Type Locality:
Dimorph of:
This page provides mineralogical data about Georgbokiite.
Unique Identifiers
Mindat ID:
6967
Long-form identifier:
mindat:1:1:6967:6
IMA Classification of Georgbokiite
Approved
IMA Formula:
Cu2+5O2(Se4+O3)2Cl2
Approval year:
1996
Type description reference:
Classification of Georgbokiite
4.JG.05
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
G : Selenites with additional anions, without H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
G : Selenites with additional anions, without H2O
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Gbk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Georgbokiite
Adamantine, Vitreous
Transparency:
Transparent
Colour:
Chestnut-brown to dark brown.
Streak:
Yellowish brown
Hardness:
4 on Mohs scale
Hardness:
VHN10=215 kg/mm2 - Vickers
Tenacity:
Sectile
Cleavage:
Perfect
{100} and {010}
{100} and {010}
Density:
4.88 g/cm3 (Calculated)
Optical Data of Georgbokiite
Type:
Biaxial (-)
RI values:
nα = 2.06(2) nβ = 2.11(2) nγ = 2.15(2)
2V:
Measured: 70° , Calculated: 82°
Max. Birefringence:
δ = 0.090
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
r < v strong
Pleochroism:
Visible
Comments:
X = yellowish brown, Y = straw-yellow; Z = dark brown
Chemistry of Georgbokiite
Mindat Formula:
Cu5(SeO3)2O2Cl2
Element Weights:
Elements listed:
Crystallography of Georgbokiite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 6.030(1) Å, b = 13.744(3) Å, c = 5.562(1) Å
β = 95.75(1)°
β = 95.75(1)°
Ratio:
a:b:c = 0.439 : 1 : 0.405
Unit Cell V:
458.64 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0011082 | Georgbokiite | Krivovichev S V, Shuvalov R R, Semenova T F, Filatov S K (1999) Crystal chemistry of inorganic compounds based on chains of oxocentered tetrahedra. III. Crystal structure of georgbokiite, Cu5O2(SeO3)2Cl2 Zeitschrift fur Kristallographie 214 135-138 |  | 1999 | Tolbachik volcano, Kamchatka, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.990 Å | (100) |
| 2.296 Å | (95) |
| 2.963 Å | (94) |
| 6.88 Å | (68) |
| 2.566 Å | (67) |
| 5.511 Å | (50) |
| 2.265 Å | (28) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45a : [Sulfates, arsenates, selenates, antimonates] | |
| 45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Georgbokiite
General Appearance of Type Material:
complex equant to short prismatic crystals
Place of Conservation of Type Material:
Mineralogy Museum, St. Petersburg University; Mining Institute, St. Petersburg, Russia.
Geological Setting of Type Material:
fumarolic sublimate.
Associated Minerals at Type Locality:
Synonyms of Georgbokiite
Other Language Names for Georgbokiite
Related Minerals - Strunz-mindat Grouping
| 4.JG. | Prewittite | KPb1.5ZnCu6(SeO3)2O2Cl10 |
| 4.JG. | Masaitisite | KCu5O2(SeO3)2Cl3 |
| 4.JG. | Wangkuirenite | Pb3Cl2(SeO3)2 |
| 4.JG. | Guangyuanite | Pb3Cl3(Se4+O3)(OH) |
| 4.JG.05 | Parageorgbokiite | Cu5(SeO3)2O2Cl2 |
| 4.JG.10 | Chloromenite | Cu9(SeO3)4O2Cl6 |
| 4.JG.15 | Sofiite | Zn2(SeO3)Cl2 |
| 4.JG.20 | Ilinskite | (Na,K)Cu5(SeO3)2O2Cl3 |
| 4.JG.25 | Francisite | Cu3Bi(SeO3)2O2Cl |
| 4.JG.30 | Derriksite | Cu4(UO2)(SeO3)2(OH)6 |
| 4.JG.35 | Burnsite | KCdCu2+7(SeO3)2O2Cl9 |
| 4.JG.40 | Allochalcoselite | Cu+PbCu2+5(SeO3)2Cl5O2 |
| 4.JG.45 | Nicksobolevite | Cu7(SeO3)2O2Cl6 |
| 4.JG.50 | Plumboselite | Pb3O2(SeO3) |
| 4.JG.55 | Sarrabusite | Pb5CuCl4(SeO3)4 |
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.
Internet Links for Georgbokiite
mindat.org URL:
https://www.mindat.org/min-6967.html
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References for Georgbokiite
Reference List:
Krivovichev, S. V.; Shuvalov, R. R.; Semenova, T. F.; Filatov, S. K. (1999) Crystal chemistry of inorganic compounds based on chains of oxocentered tetrahedra III. Crystal structure of georgbokiite, Cu₅O₂(SeO₃)₂Cl₂. Zeitschrift für Kristallographie, 214 (3). 135-138 doi:10.1524/zkri.1999.214.3.135
Localities for Georgbokiite
Showing 3 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Vergasova L.P. et al. (1999) +3 other references |
| Pekov (1998) +1 other reference |
| Pekov (1998) |
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Glavnoye fumarole, Southern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia