Chekhovichite Mineral Data

General Chekhovichite Information

Chemical Formula:

(Bi,Pb,Fe)2Te4O11

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

Empirical Formula:

Bi_1.2Pb_0.6Fe²⁺_0.3Te₄O₁₁

Environment:

A rare oxidation product of earlier tellurium-bearing minerals.

IMA Status:

Approved IMA 1987

Locality:

Zod deposit, 14 km east of Vardenis, Armenia. Link to MinDat.org Location Data.

Name Origin:

Named for Sergei Konstatinovich Chekhovich (1917-1997), mineralogist and geologist, Polytechnical Institute of Alma-Ata, Kazakhstan.

Synonym:

ICSD 72709

PDF 42-1323

Chekhovichite Image

Images:

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

Axial Ratios:

a:b:c =2.3803:1:0.8692

Cell Dimensions:

a = 19, b = 7.982, c = 6.938, Z = 4; beta = 95.67° V = 1,047.06 Den(Calc)= 6.84

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.14(1), 3.29(1), 3.15(0.94),

Crystal Structure:

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Rossell H J , Leblanc M , Ferey G , Bevan D J M , Simpson D J , Taylor M R , Australian Journal of Chemistry , 45 (1992) p.1415-1425, On the crystal structure of Bi2Te4O11, Locality: synthetic

Physical Properties of Chekhovichite

Cleavage:

{hk0} Perfect, {hk0} Perfect

Color:

Gray green, Gray white.

Density:

6.88

Diaphaneity:

Subtransparent

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.

Habit:

Twinning Common - Crystals are usually twinned.

Hardness:

4 - Fluorite

Luster:

Adamantine

Streak:

white

Optical Properties of Chekhovichite

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

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.

RL Anisotrophism:

Marked.

RL Bireflectance:

Observable.

RL Color:

Pale gray to gray with white internal reflections.

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

Electron Density:

Bulk Density (Electron Density)=5.78 gm/cc
note: Specific Gravity of Chekhovichite =6.88 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_{Chekhovichite}= 830.21 barns/electron
U=PE_{Chekhovichite} x rElectron Density=4,795.19 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chekhovichite is Not Radioactive

Chekhovichite Classification

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

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

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Am.Min.,Vol.74,p1400,1989) OPTIC PROP.(AmMin.,Vol.74,p1400,1989)

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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Print or Cut-and-Paste your Chekhovichite Specimen Label here :

Chekhovichite

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

Notes: