Chekhovichite
A valid IMA mineral species
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About Chekhovichite
Formula:
Bi2Te4+4O11
Colour:
Grayish yellow, pale gray, or grayish green
Lustre:
Adamantine
Hardness:
4
Specific Gravity:
6.88
Crystal System:
Monoclinic
Name:
Name in honor of Sergei Konstantinovich Chekhovich (Сергей Константинович Чехович) (1917-1997), mineralogist and professor at the Polytechnic Institute, Alma Ata, Kazakhstan.
This page provides mineralogical data about Chekhovichite.
Unique Identifiers
Mindat ID:
984
Long-form identifier:
mindat:1:1:984:9
GUID
(UUID V4):
(UUID V4):
1e0c99e3-9783-4ded-b1c0-6ebd051d93ea
IMA Classification of Chekhovichite
Approved
IMA Formula:
Bi3+2Te4+4O11
First published:
1987
Classification of Chekhovichite
4.JK.35
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
K : Tellurites without 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
K : Tellurites without additional anions, without H2O
34.6.4.1
34 : SELENITES, TELLURITES AND SULFITES
6 : Anhydrous Selenites, Tellurites and Sulfites containing Hydroxyl or Halogen
34 : SELENITES, TELLURITES AND SULFITES
6 : Anhydrous Selenites, Tellurites and Sulfites containing Hydroxyl or Halogen
28.3.17
28 : Selenites, Selenates, Tellurites, and Tellurates
3 : Tellurites
28 : Selenites, Selenates, Tellurites, and Tellurates
3 : Tellurites
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 |
|---|---|---|
| Ckh | 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 Chekhovichite
Adamantine
Transparency:
Translucent
Colour:
Grayish yellow, pale gray, or grayish green
Streak:
White
Hardness:
4 on Mohs scale
Hardness:
VHN100=205 - 325 kg/mm2 - Vickers
Cleavage:
Perfect
One perfect parallel to elongation.
Less perfect 87 degrees from first cleavage.
One perfect parallel to elongation.
Less perfect 87 degrees from first cleavage.
Density:
6.88(1) g/cm3 (Measured) 7 g/cm3 (Calculated)
Optical Data of Chekhovichite
Type:
Biaxial (-)
RI values:
nα = 2.450(2) nβ = 2.500(2) nγ = 2.650(2)
2V:
Measured: 65° , Calculated: 64°
Max Birefringence:
δ = 0.200
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Anisotropism:
Marked
Bireflectance:
Observable
Dispersion:
r < v strong
Reflectivity:
| Wavelength | R1 | R2 |
|---|---|---|
| 400nm | 18.9% | 21.4% |
| 420nm | 18.8% | 21.4% |
| 440nm | 18.7% | 21.3% |
| 460nm | 18.6% | 21.3% |
| 480nm | 18.3% | 21.2% |
| 500nm | 18.1% | 21.2% |
| 520nm | 18.1% | 21.1% |
| 540nm | 17.9% | 21.0% |
| 560nm | 17.7% | 20.8% |
| 580nm | 17.6% | 20.7% |
| 600nm | 17.4% | 20.6% |
| 620nm | 17.3% | 21.5% |
| 640nm | 17.3% | 20.4% |
| 660nm | 17.2% | 20.3% |
| 680nm | 17.2% | 20.2% |
| 700nm | 17.1% | 20.2% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 21.5%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Pale gray to gray
Internal Reflections:
White
Chemistry of Chekhovichite
Mindat Formula:
Bi2Te4+4O11
Elements listed:
Crystallography of Chekhovichite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 18.8963(8) Å, b = 7.9563(8) Å, c = 6.9909(3) Å
β = 95.176(3)°
β = 95.176(3)°
Ratio:
a:b:c = 2.375 : 1 : 0.879
Unit Cell V:
1,046.76 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Subhedral platy grains
Twinning:
Polysynthetic, parallel elongation.
Comment:
On synthetic material
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
|---|---|---|---|---|---|---|---|
| 0012058 | Chekhovichite | Rossell H J, Leblanc M, Ferey G, Bevan D J M, Simpson D J, Taylor M R (1992) On the crystal structure of Bi2Te4O11 Australian Journal of Chemistry 45 1415-1425 | 1992 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.29 Å | (100) |
| 3.14 Å | (100) |
| 3.15 Å | (94) |
| 2.728 Å | (48) |
| 1.998 Å | (45) |
| 2.002 Å | (42) |
| 1.686 Å | (32) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47e : [Vanadates, chromates, manganates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Geological Setting:
Rare oxidation product of tellurides.
Type Occurrence of Chekhovichite
Co-Type Localities:
General Appearance of Type Material:
Crusts on quartz, as small pockets in limonite, and as pseudomorphs after tellurobismuthite. Aggregates are up to 5 mm across; individual grains are up to 0.1 mm in size.
Place of Conservation of Type Material:
Mining Museum, St. Petersburg, Russia, 1945/1.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 88052.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 88052.
Geological Setting of Type Material:
In fractures in quartz and chalcedony in oxidized ores.
Associated Minerals at Type Locality:
Reference:
Spiridonov, E.M., Petrova, I.V., Demina, L.A., Dolgikh, V.I., Antonyan, G.M. (1987) The new mineral chekhovichite (Bi2Te4O11). Vestnik Moskovskogo Universiteta, Geologiya (Moscow University Geology Bulletin): 42(6): 71-75.
Synonyms of Chekhovichite
Other Language Names for Chekhovichite
German:Chekhovichit
Spanish:Chekhovichita
Related Minerals - Strunz-mindat Grouping
| 4.JK. | Matthiasweilite | PbTe4+O3 |
| 4.JK.05 | Winstanleyite | TiTe4+3O8 |
| 4.JK.05 | Walfordite | (Fe3+,Te6+)Te4+3O8 |
| 4.JK.10 | Spiroffite | Mn2+2Te4+3O8 |
| 4.JK.10 | Zincospiroffite | Zn2Te4+3O8 |
| 4.JK.15 | Balyakinite | Cu(TeO3) |
| 4.JK.20 | Rajite | Cu(Te4+2O5) |
| 4.JK.25 | Carlfriesite | CaTe4+2Te6+O8 |
| 4.JK.30 | Denningite | (Mn2+,Ca,Zn)Te4+2O5 |
| 4.JK.40 | Smirnite | Bi2Te4+O5 |
| 4.JK.45 | Choloalite | (Cu,Sb)3(Pb,Ca)3(TeO3)6Cl |
| 4.JK.50 | Fairbankite | Pb2+12(Te4+O3)11(SO4) |
| 4.JK.55 | Plumbotellurite | Pb(TeO3) |
| 4.JK.60 | Magnolite | [Hg2]2+[Te4+O3] |
| 4.JK.65 | Moctezumite | Pb(UO2)(TeO3)2 |
| 4.JK.70 | Schmitterite | (UO2)(TeO3) |
| 4.JK.75 | Cliffordite | (UO2)Te4+3O7 |
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 Chekhovichite
mindat.org URL:
https://www.mindat.org/min-984.html
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References for Chekhovichite
Localities for Chekhovichite
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.
Armenia (TL) | |
| Spiridonov et al. (1987) +2 other references |
Canada | |
| Liferovich & Mitchell pers. comm. L. ... |
Kazakhstan (TL) | |
| Spiridonov et al. (1987) +2 other references |
| Spiridonov et al. (1987) +2 other references |
Mexico | |
| Desor (11/2020) |
Russia | |
| R. V. Kuzhuget et al. (2017) |
USA | |
| SEM-EDS analyzed by Dr. Rob Bowell. |
Quick NavTopAbout ChekhovichiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesStrunz-MindatOther InformationInternet Links References Localities Locality List
Sotk gold mine, Sotk, Gegharkunik Province, Armenia