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Chekhovichite

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Zod Mine (Sotk deposit), Vardenis, Gelark'unik' (Geghark'unik') Province, Armenia
© Brent Thorne

Formula:
Bi
 
2
Te
 
4
O
 
11
System:MonoclinicColour: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

IMA status:Approved
Strunz 8th edition ID:4/K.04-20
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:34.6.4.1

34 : SELENITES, TELLURITES AND SULFITES
6 : Anhydrous Selenites, Tellurites and Sulfites containing Hydroxyl or Halogen
Hey's CIM Ref.:28.3.17

28 : Selenites, Selenates, Tellurites, and Tellurates
3 : Tellurites
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Type Occurrence of Chekhovichite

Co-type Localities:Zod Mine (Sotk deposit), Vardenis, Gelark'unik' (Geghark'unik') Province, Armenia
Northern Aksu deposit, Aksu ore field, Aqmola Oblysy (Akmola [Tselinograd] Oblast'), Kazakhstan
Zhana-Tyube Au deposit, Kökshetaü Oblysy (Kokshatau [Kokchetav] Oblast'), Kazakhstan
Place of Conservation of Type 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

Lustre: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 (measured):6.88(1) g/cm3
Density (calculated):7 g/cm3

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°
Maximum Birefringence:δ = 0.200

Chart 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:
Bi
 
2
Te
 
4
O
 
11
Essential elements:Bi, O, Te
All elements listed in formula:Bi, O, Te
Empirical Formula:
Bi
 
2
Te
4+
4
O
 
11

Relationship of Chekhovichite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JK.05Winstanleyite
TiTe
 
3
O
 
8
4.JK.05Walfordite
(Fe
3+
 
,Te
6+
 
)Te
4+
3
O
 
8
4.JK.10Spiroffite
(Mn,Zn)
 
2
Te
 
3
O
 
8
4.JK.10Zincospiroffite
Zn
 
2
[Te
 
3
O
 
8
]
4.JK.15Balyakinite
CuTeO
 
3
4.JK.20Rajite
Cu[Te
4+
2
O
 
5
]
4.JK.25Carlfriesite
CaTe
 
3
O
 
8
4.JK.30Denningite
(Mn
2+
 
,Ca,Zn)[Te
4+
2
O
 
5
]
4.JK.40Smirnite
(BiO)
 
2
[TeO
 
3
]
4.JK.45Choloalite
PbCu[TeO
 
3
]
 
2
 · H
 
2
O
4.JK.50Fairbankite
PbTeO
 
3
4.JK.55Plumbotellurite
PbTeO
 
3
4.JK.60Magnolite
Hg
 
2
TeO
 
3
4.JK.65Moctezumite
PbUO
 
2
(TeO
 
3
)
 
2
4.JK.70Schmitterite
(UO
 
2
)[TeO
 
3
]
4.JK.75Cliffordite
UTe
 
3
O
 
9
Related Minerals - Hey's Index Grouping:

- +
28.3.1Balyakinite
CuTeO
 
3
28.3.2Rajite
Cu[Te
4+
2
O
 
5
]
28.3.3Graemite
Cu[TeO
 
3
] · H
 
2
O
28.3.4Teineite
Cu[TeO
 
3
] · 2H
 
2
O
28.3.5Cesbronite
Cu
 
5
[(OH)
 
3
|TeO
 
3
]
 
2
 · 2H
 
2
O
28.3.6Mroseite
CaTeO
 
2
CO
 
3
28.3.7Quetzalcoatlite
Zn
 
6
Cu
 
3
(TeO
 
6
)
 
2
(OH)
 
6
·Ag
 
x
Pb
 
y
Cl
 
x+2y
28.3.8Zemannite
(H,Na)
 
2
(Zn,Fe)
 
2
(TeO
 
3
)
 
3
·nH
 
2
O
28.3.9Kinichilite
(Fe,Mg,Zn)
 
2
(TeO
 
3
)
 
3
(Na
 
x
H
 
2-x
)·3H
 
2
O
28.3.10Denningite
(Mn
2+
 
,Ca,Zn)[Te
4+
2
O
 
5
]
28.3.11Spiroffite
(Mn,Zn)
 
2
Te
 
3
O
 
8
28.3.12Winstanleyite
TiTe
 
3
O
 
8
28.3.13Fairbankite
PbTeO
 
3
28.3.14Plumbotellurite
PbTeO
 
3
28.3.15Choloalite
PbCu[TeO
 
3
]
 
2
 · H
 
2
O
28.3.16Smirnite
(BiO)
 
2
[TeO
 
3
]
28.3.18Cliffordite
UTe
 
3
O
 
9
28.3.19Schmitterite
(UO
 
2
)[TeO
 
3
]
28.3.20Moctezumite
PbUO
 
2
(TeO
 
3
)
 
2
28.3.21Emmonsite
Fe
3+
2
[TeO
 
3
]
 
3
 · 2H
 
2
O
28.3.22Blakeite
Fe
3+
2
[TeO
 
3
]
 
3
 (?)
28.3.23Mackayite
Fe
3+
 
[OH|Te
4+
2
O
 
5
]
28.3.24Poughite
Fe
3+
2
[SO
 
4
|(TeO
 
3
)
 
2
] · 3H
 
2
O
28.3.25Sonoraite
Fe
3+
 
[OH|TeO
 
3
] · H
 
2
O
28.3.26Rodalquilarite
H
 
3
Fe
 
2
(TeO
 
3
)
 
4
Cl
28.3.27Eztlite
Pb
 
2
Fe
3+
6
[(OH)
 
10
|(Te
4+
 
O
 
3
)
 
3
|Te
6+
 
O
 
6
] · 8H
 
2
O
28.3.28Keystoneite
(Ni,Mg,Fe,Mn)
 
3
Te
 
3
O
 
9
·5H
 
2
O

Other Names for Chekhovichite

Synonyms:
IMA1986-039
Other Languages:
German:Chekhovichit
Spanish:Chekhovichita

Other Information

Health Warning: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

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  • Raman and XRD data at RRUFF project
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    Localities for Chekhovichite

    (TL) indicates type locality. ? 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' (Geghark'unik') Province
      • Vardenis
    		AM 74 (1989), 1400; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Kazakhstan
     
    • Aqmola Oblysy (Akmola [Tselinograd] Oblast')
      • Aksu ore field
    		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
    • Kökshetaü Oblysy (Kokshatau [Kokchetav] Oblast')
    		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
    Mineral and/or Locality
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