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Chekhovichite

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Formula:
Bi2Te44+O11
System:
Monoclinic
Colour:
Grayish yellow, pale ...
Hardness:
4
Name:
For Professor Sergei Konstantinovich Chekhovich (1917-1997) Mineralogist, Alma Ata, Kazakhstan.
This page provides mineralogical data about Chekhovichite.

Classification of Chekhovichite

Approved
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
34.6.4.1

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
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First Recorded Occurrence of Chekhovichite

Place of Conservation of First Recorded Material:
A E Fernsman Museum, Moscow 88052
Year of Discovery:
1987

Occurrences of Chekhovichite

Geological Setting:
Rare oxidation product of tellurides.

Physical Properties of Chekhovichite

Adamantine
Diaphaneity (Transparency):
Translucent
Colour:
Grayish yellow, pale gray, or grayish green.
Streak:
White
Hardness (Mohs):
4
Hardness (Vickers):
VHN100=205 - 325 kg/mm2
Cleavage:
Perfect
One perfect parallel to elongation
Less perfect 87 degrees from first cleavage
Density:
6.88(1) g/cm3 (Measured)    7 g/cm3 (Calculated)

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)°
Ratio:
a:b:c = 2.375 : 1 : 0.879
Unit Cell Volume:
V 1,046.76 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Subhedral platy grains
Twinning:
Polysynthetic, parallel elongation.
Comment:
On synthetic material

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.
Surface Relief:
Very High
Type:
Anisotropic
Anisotropism:
Marked
Bireflectance:
Observable
Dispersion:
r < v strong
Colour in reflected light:
Pale gray to gray
Internal Reflections:
White

Chemical Properties of Chekhovichite

Formula:
Bi2Te44+O11
Essential elements:
All elements listed in formula:
Empirical Formula:
Bi2Te44+O11

Relationship of Chekhovichite to other Species

4.JK.05WinstanleyiteTiTe34+O8
4.JK.05Walfordite(Fe3+,Te6+)Te34+O8
4.JK.10Spiroffite(Mn,Zn)2Te34+O8
4.JK.10ZincospiroffiteZn2Te34+O8
4.JK.15BalyakiniteCu(TeO3)
4.JK.20RajiteCu(Te24+O5)
4.JK.25CarlfriesiteCaTe24+Te6+O8
4.JK.30Denningite(Mn2+,Ca,Zn)Te24+O5
4.JK.40SmirniteBi2Te4+O5
4.JK.45Choloalite(Cu,Sb)3(Pb,Ca)3(TeO3)6Cl
4.JK.50FairbankitePb(TeO3)
4.JK.55PlumbotelluritePb(TeO3)
4.JK.60Magnolite(Hg2+)(Te4+O3)
4.JK.65MoctezumitePb(UO2)(TeO3)2
4.JK.70Schmitterite(UO2)(TeO3)
4.JK.75Cliffordite(UO2)Te34+O7
28.3.1BalyakiniteCu(TeO3)
28.3.2RajiteCu(Te24+O5)
28.3.3GraemiteCu[TeO3] · H2O
28.3.4TeineiteCu[TeO3] · 2H2O
28.3.5CesbroniteCu5(TeO3)2(OH)6 · 2H2O
28.3.6MroseiteCaTe4+(CO3)O2
28.3.7QuetzalcoatliteZn6Cu3(TeO6)2(OH)6 · AgxPbyClx+2y
28.3.8ZemanniteMg(ZnFe)2(TeO3)6·9H2O
28.3.9Kinichilite(Fe,Mg,Zn)2(TeO3)3(NaxH2-x) · 3H2O
28.3.10Denningite(Mn2+,Ca,Zn)Te24+O5
28.3.11Spiroffite(Mn,Zn)2Te34+O8
28.3.12WinstanleyiteTiTe34+O8
28.3.13FairbankitePb(TeO3)
28.3.14PlumbotelluritePb(TeO3)
28.3.15Choloalite(Cu,Sb)3(Pb,Ca)3(TeO3)6Cl
28.3.16SmirniteBi2Te4+O5
28.3.18Cliffordite(UO2)Te34+O7
28.3.19Schmitterite(UO2)(TeO3)
28.3.20MoctezumitePb(UO2)(TeO3)2
28.3.21EmmonsiteFe23+[TeO3]3 · 2H2O
28.3.22BlakeiteFe23+[TeO3]3 (?)
28.3.23MackayiteFe3+(Te24+O5)(OH)
28.3.24PoughiteFe23+(TeO3)2(SO4)(H2O)2 · H2O
28.3.25SonoraiteFe3+(TeO3)(OH) · H2O
28.3.26RodalquilariteFe2(TeO2OH)3(TeO3)Cl
28.3.27EztlitePb2Fe63+(Te4+O3)3(Te6+O6)(OH)10 · 8H2O
28.3.28Keystoneite(Ni,Mg,Fe,Mn)3Te3O9 · 5H2O

Other Names for Chekhovichite

Name in Other Languages:

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.

References for Chekhovichite

Reference List:
American Mineralogist: 74: 1400.

Moscow University Geology Bulletin: 42(6): 71-76.

Revue de Chimie Minérale: 9: 837-844.

Internet Links for Chekhovichite

Localities for Chekhovichite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Armenia
 
  • Gelark'unik' Province (Geghark'unik')
    • Vardenis
AM 74 (1989), 1400; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Canada
 
  • Ontario
    • Thunder Bay District
Liferovich & Mitchell pers. comm. L. Horváth 2005: L. Horváth 2009
Kazakhstan
 
  • Akmola Province (Aqmola Oblysy; Akmolinskaya Oblast')
    • Stepnogorsk
      • Aksu (Aqsu)
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
USA
 
  • Utah
    • Utah Co.
      • East Tintic Mts
        • East Tintic District
SEM-EDS analzyed by Dr. Rob Bowell.
Mineral and/or Locality  
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