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Kochkarite

A valid IMA mineral species
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06090170014963671171985.jpg
Kochkarite

Kochkar' Au deposit, Plast, Plastovsky District, Chelyabinsk Oblast, Russia
02789110016037418555759.jpg
Kochkarite, etc.

Limestone quarry, Lorüns, Bludenz District, Vorarlberg, Austria
06090170014963671171985.jpg
Kochkarite

Kochkar' Au deposit, Plast, Plastovsky District, Chelyabinsk Oblast, Russia
02789110016037418555759.jpg
Kochkarite, etc.

Limestone quarry, Lorüns, Bludenz District, Vorarlberg, Austria
06090170014963671171985.jpg
Kochkarite

Kochkar' Au deposit, Plast, Plastovsky District, Chelyabinsk Oblast, Russia
02789110016037418555759.jpg
Kochkarite, etc.

Limestone quarry, Lorüns, Bludenz District, Vorarlberg, Austria
Hide all sections | Show all sections

About KochkariteHide

Formula:
PbBi4Te7
Colour:
Silver-gray
Lustre:
Metallic
Hardness:
2 - 2½
Specific Gravity:
7.94
Crystal System:
Trigonal
Member of:
Aleksite Group
Name:
Named for the Kochkar deposit, Russia, the type locality.
Aleksite Group.


Unique IdentifiersHide

Mindat ID:
2234
Long-form identifier:
mindat:1:1:2234:3
GUID
(UUID V4):
5edf31b9-8ec2-4568-b3f8-a0b4dab93a1e

IMA Classification of KochkariteHide

Classification of KochkariteHide

Strunz-mindat (2024):
2.GC.40b

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
C : Poly-sulfarsenites
Dana 8th ed.:
2.6.3.1

2 : SULFIDES
6 : AmBnXp, with (m+n):p = 4:3
Hey's CIM Ref.:
3.7.37

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
7 : Sulphides etc. of V, As, Sb and Bi

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
KocIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of KochkariteHide

Lustre:
Metallic
Colour:
Silver-gray
Streak:
Lead-gray
Hardness:
2 - 2½ on Mohs scale
Tenacity:
Flexible
Cleavage:
Perfect
Basal
Density:
7.94(3) g/cm3 (Measured)    7.89 g/cm3 (Calculated)

Optical Data of KochkariteHide

Anisotropism:
Strong
Bireflectance:
Clearly visible
Reflectivity:
WavelengthR1R2
400nm61.3%58.2%
440nm61.6%58.6%
480nm61.9%58.7%
520nm62.9%58.8%
560nm63.6%59.2%
600nm64.4%59.8%
640nm65.1%60.6%
680nm66.0%61.7%
700nm66.3%62.1%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 66.3%.
R1 shown in black, R2 shown in red
Colour in reflected light:
White with pink tones

Chemistry of KochkariteHide

Mindat Formula:
PbBi4Te7
Elements listed:
Bi, Pb, Te - search for minerals with similar chemistry

Crystallography of KochkariteHide

Crystal System:
Trigonal
Cell Parameters:
a = 4.416(8) Å, c = 72.09(10) Å
Ratio:
a:c = 1 : 16.325
Unit Cell V:
1,217.49 ų (Calculated from Unit Cell)
Z:
3
Comment:
Point Group: 4/m 3 2/m, 43m, or 432. Space Group: Im3m, I432, or I43m.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0015543KochkariteTalybov A G, Vainshtein B K (1962) An electron diffraction study of the structure of PbBi4Te7 Loality: synthetic Soviet Physics Crystallography 6 432-43819620293
0015545KochkariteTalybov A G, Vainshtein B K (1962) An electron diffraction study of the second superlattice in PbBi4Te7 Soviet Physics Crystallography 7 32-371962synthetic0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.228 Å(100)
2.364 Å(58)
2.212 Å(19)
2.005 Å(33)
1.983 Å(18)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of KochkariteHide

Type Locality:
ⓘ Kochkar' Au deposit, Plast, Plastovsky District, Chelyabinsk Oblast, Russia
General Appearance of Type Material:
Platy tabular crystals, often curved, measuring up to 10 x 10 x 3 mm.
Place of Conservation of Type Material:
A. E. Fersman Mineralogical Museum, Moscow, Russia.
Geological Setting of Type Material:
In a hornblende hornfels zone of a contact metamorphic aureole
Associated Minerals at Type Locality:
WittiteRucklidgeiteQuartzPyrrhotiteGold
GalenaAleksite
Reference:
Spiridonov, E.M., Ershova, N.A., Tananaeva, O.I. (1989) Kochkarite PbBi4Te7 - A new mineral from contact metamorphosed ores. Geologiya Rudnykh Mestorozhdenii: 31: 98-102.
Download:
https://rruff.info/rruff_1.0/uploads/GRM31_98.pdf

Synonyms of KochkariteHide

Other Language Names for KochkariteHide

German:Kochkarit
Spanish:Kochkarita

Relationship of Kochkarite to other SpeciesHide

Member of:
Aleksite Group
Other Members of this group:
AleksitePbBi2Te2S2Trig. 3m (3 2/m) : P3 1m
BabkinitePb2Bi2(S,Se)3Trig.
PoubaitePbBi2(Se,Te,S)4Trig. 3m (3 2/m) : R3m
RucklidgeitePbBi2Te4Trig. 3m (3 2/m) : R3m
SaddlebackitePb2Bi2Te2S3Hex.

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Kochkarite associated with ChalcopyriteCuFeS2
1 photo of Kochkarite associated with HematiteFe2O3
1 photo of Kochkarite associated with ClinochloreMg5Al(AlSi3O10)(OH)8
1 photo of Kochkarite associated with Chamosite(Fe2+)5Al(Si,Al)4O10(OH,O)8
1 photo of Kochkarite associated with CalciteCaCO3
1 photo of Kochkarite associated with QuartzSiO2
1 photo of Kochkarite associated with Monazite-(Ce)Ce(PO4)

Related Minerals - Strunz-mindat GroupingHide

2.GC.ClogauitePbBi4Te4S3Trig. 3m (3 2/m) : P3m1
2.GC.05HatchiteAgTlPbAs2S5Tric. 1 : P1
2.GC.05Wallisite(Cu,Ag)TlPbAs2S5Tric. 1 : P1
2.GC.10SinneriteCu6As4S9Tric. 1 : P1
2.GC.15WatanabeiteCu4(As,Sb)2S5Orth.
2.GC.20SimoniteTlHgAs3S6Mon. 2/m
2.GC.25QuadratiteAg(Cd,Pb)AsS3Tet. 4 2 2 : P43 2 2
2.GC.25ManganoquadratiteAgMnAsS3Tet. 4 2 2 : P43 2 2
2.GC.30SmithiteAgAsS2Mon. 2/m
2.GC.35TrechmanniteAgAsS2Trig. 3 : R3
2.GC.35DebattistiiteAg9Hg0.5As6S12Te2 Tric. 1 : P1
2.GC.40aAleksitePbBi2Te2S2Trig. 3m (3 2/m) : P3 1m
2.GC.40cPoubaitePbBi2(Se,Te,S)4Trig. 3m (3 2/m) : R3m
2.GC.40cRucklidgeitePbBi2Te4Trig. 3m (3 2/m) : R3m
2.GC.40eBabkinitePb2Bi2(S,Se)3Trig.
2.GC.40dSaddlebackitePb2Bi2Te2S3Hex.
2.GC.45TvalchrelidzeiteHg3SbAsS3Mon. 2/m
2.GC.50MutnovskitePb4As2S6IClOrth. mmm (2/m 2/m 2/m) : Pnma

Other InformationHide

Thermal Behaviour:
Melts at 580 C
Notes:
Tarnishes in air
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 KochkariteHide

References for KochkariteHide

Localities for KochkariteHide

This 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.

Locality ListHide

- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Austria
 
  • Vorarlberg
    • Bludenz District
      • Lorüns
Kolitsch et al. (2020)
Canada
 
  • British Columbia
    • Omineca Mining Division
      • Lindquist Lake
Roberts (2017)
Cuba
 
  • Villa Clara Province
Torró et al. (2016)
Peru
 
  • Arequipa
    • Condesuyos Province
      • Rio Grande district
Alfonso et al. (2023)
Russia
 
  • Chelyabinsk Oblast
    • Agapovsky District
Kasatkin et al. (2022)
    • Plastovsky District
      • Plast
Spiridonov et al. (1989) +1 other reference
  • Chukotka Autonomous Okrug
    • Chaunskii District (Chaun)
Bortnikov et al. (2004)
  • Murmansk Oblast
Chernyavsky et al. (2012) +1 other reference
  • Sakha
    • Stanovoi Range
      • Sutamskii Region
Pekov (1998)
  • Sverdlovsk Oblast
    • Karpinsk Urban Okrug
Maslennikov et al. (2013)
Sweden
 
  • Västerbotten County
    • Skellefteå
      • Skellefte mining district
        • Boliden
Färber (n.d.)
USA
 
  • Michigan
    • Marquette County
      • Ishpeming Greenstone belt (Marquette Greenstone belt)
Heinrich et al. (2004)
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