Mineralogy Database

Chekhovichite Mineral Data

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General Chekhovichite Information

Help on Chemical  Formula: Chemical Formula: (Bi,Pb,Fe)2Te4O11
Help on Composition: Composition: Molecular Weight = 1,078.24 gm
   Iron        1.55 %  Fe    2.00 % FeO
   Bismuth    23.26 %  Bi   25.93 % Bi2O3
   Tellurium  47.34 %  Te   59.21 % TeO2
   Lead       11.53 %  Pb   12.42 % PbO
   Oxygen     16.32 %  O
             ______        ______ 
             100.00 %       99.55 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Bi1.2Pb0.6Fe2+0.3Te4O11
Help on Environment: Environment: A rare oxidation product of earlier tellurium-bearing minerals.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Zod deposit, 14 km east of Vardenis, Armenia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Sergei Konstatinovich Chekhovich (1917-1997), mineralogist and geologist, Polytechnical Institute of Alma-Ata, Kazakhstan.
Help on Synonym: Synonym: ICSD 72709
  PDF 42-1323
 

Chekhovichite Image

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  Chekhovichite

Comments: Crude, white transparent subhedral chekhovichite crystal.
Location: Zod Deposit, 14 km East of Verdenis, Armenia. Scale: Specimen Size 2x7 mm.
© Diederik Visser

Chekhovichite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.3803:1:0.8692
Help on Cell Dimensions: Cell Dimensions: a = 19, b = 7.982, c = 6.938, Z = 4; beta = 95.67° V = 1,047.06 Den(Calc)= 6.84
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.14(1), 3.29(1), 3.15(0.94),
 

Physical Properties of Chekhovichite

Help on Cleavage: Cleavage: {hk0} Perfect, {hk0} Perfect
Help on Color: Color: Gray green, Gray white.
Help on Density: Density: 6.88
Help on Diaphaneity: Diaphaneity: Subtransparent
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white
 

Optical Properties of Chekhovichite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.245 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.253 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2242,KPDmeas= 0.2229,KC= 0.179
Ncalc = 2.22 - 2.23
Help on Optical Data: Optical Data: Biaxial (-), a=2.45, b=2.5, g=2.65, bire=0.2000, 2V(Calc)=64, 2V(Meas)=65. Dispersion r < v distinct.
Help on RL Anisotrophism: RL Anisotrophism: Marked.
Help on RL Bireflectance: RL Bireflectance: Observable.
Help on RL Color: RL Color: Pale gray to gray with white internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Chekhovichite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   18.90   21.40 
   
 420 nm   18.80   21.40 
 440 nm   18.70   21.30 
 460 nm   18.60   21.30 
 480 nm   18.30   21.20 
 500 nm   18.10   21.20 
 520 nm   18.10   21.10 
 540 nm   17.90   21.00 
 560 nm   17.70   20.80 
 580 nm   17.60   20.70 
 600 nm   17.40   20.60 
 620 nm   17.30   20.50 
 640 nm   17.30   20.40 
 660 nm   17.20   20.30 
 680 nm   17.20   20.20 
 700 nm   17.10   20.20 
Calculated Relative Intensity Colors of Chekhovichite in Air
Relative
Intensity
   0%   50% 100% 150% 200% 250% 300% 350% 400% 450% 500%
R1                      
R2                      
 

Calculated Properties of Chekhovichite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.78 gm/cc
note: Specific Gravity of Chekhovichite =6.88 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEChekhovichite = 830.21 barns/electron
U=PEChekhovichite x rElectron Density=4,795.19 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chekhovichite is Not Radioactive
 

Chekhovichite Classification

Help on  Dana Class: Dana Class: 34.06.04.01 (34)Selenites - Tellurites - Sulfites
  (34.06)Dana Type
  (34.06.04)Dana Group
 
34.06.04.01 Chekhovichite (Bi,Pb,Fe)2Te4O11 P 21 2
Help on  Strunz Class: Strunz Class: 04.JK.35 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JK -Tellurites without additional anions, without H2O
 
04.JK.35 Chekhovichite (Bi,Pb,Fe)2Te4O11 P 21 2
 

Other Chekhovichite Information

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Am.Min.,Vol.74,p1400,1989) OPTIC PROP.(AmMin.,Vol.74,p1400,1989)
Help on See Also: See Also: Links to other databases for Chekhovichite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Chekhovichite

(Bi,Pb,Fe)2Te4O11
Dana No: 34.06.04.01 Strunz No: 04.JK.35
Locality:

 

Notes:

 

 
   
 


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