Kochkarite
A valid IMA mineral species
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About Kochkarite
Formula:
PbBi4Te7
Colour:
Silver-gray
Lustre:
Metallic
Hardness:
2 - 2½
Specific Gravity:
7.94
Crystal System:
Trigonal
Member of:
Name:
Named for the Kochkar deposit, Russia, the type locality.
Unique Identifiers
Mindat ID:
2234
Long-form identifier:
mindat:1:1:2234:3
GUID
(UUID V4):
(UUID V4):
5edf31b9-8ec2-4568-b3f8-a0b4dab93a1e
IMA Classification of Kochkarite
Approved
First published:
1989
Classification of Kochkarite
2.GC.40b
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
C : Poly-sulfarsenites
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
C : Poly-sulfarsenites
2.6.3.1
2 : SULFIDES
6 : AmBnXp, with (m+n):p = 4:3
2 : SULFIDES
6 : AmBnXp, with (m+n):p = 4:3
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
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 Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Koc | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Kochkarite
Metallic
Colour:
Silver-gray
Streak:
Lead-gray
Hardness:
2 - 2½ on Mohs scale
Tenacity:
Flexible
Cleavage:
Perfect
Basal
Basal
Density:
7.94(3) g/cm3 (Measured) 7.89 g/cm3 (Calculated)
Optical Data of Kochkarite
Anisotropism:
Strong
Bireflectance:
Clearly visible
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
400nm | 61.3% | 58.2% |
440nm | 61.6% | 58.6% |
480nm | 61.9% | 58.7% |
520nm | 62.9% | 58.8% |
560nm | 63.6% | 59.2% |
600nm | 64.4% | 59.8% |
640nm | 65.1% | 60.6% |
680nm | 66.0% | 61.7% |
700nm | 66.3% | 62.1% |
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 Kochkarite
Mindat Formula:
PbBi4Te7
Elements listed:
Crystallography of Kochkarite
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 Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0015543 | Kochkarite | Talybov A G, Vainshtein B K (1962) An electron diffraction study of the structure of PbBi4Te7 Loality: synthetic Soviet Physics Crystallography 6 432-438 | 1962 | 0 | 293 | ||
0015545 | Kochkarite | Talybov A G, Vainshtein B K (1962) An electron diffraction study of the second superlattice in PbBi4Te7 Soviet Physics Crystallography 7 32-37 | 1962 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.228 Å | (100) |
2.364 Å | (58) |
2.212 Å | (19) |
2.005 Å | (33) |
1.983 Å | (18) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Kochkarite
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:
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.
Synonyms of Kochkarite
Other Language Names for Kochkarite
German:Kochkarit
Spanish:Kochkarita
Relationship of Kochkarite to other Species
Member of:
Other Members of this group:
Aleksite | PbBi2Te2S2 | Trig. 3m (3 2/m) : P3 1m |
Babkinite | Pb2Bi2(S,Se)3 | Trig. |
Poubaite | PbBi2(Se,Te,S)4 | Trig. 3m (3 2/m) : R3m |
Rucklidgeite | PbBi2Te4 | Trig. 3m (3 2/m) : R3m |
Saddlebackite | Pb2Bi2Te2S3 | Hex. |
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Kochkarite associated with Chalcopyrite | CuFeS2 |
1 photo of Kochkarite associated with Hematite | Fe2O3 |
1 photo of Kochkarite associated with Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
1 photo of Kochkarite associated with Chamosite | (Fe2+)5Al(Si,Al)4O10(OH,O)8 |
1 photo of Kochkarite associated with Calcite | CaCO3 |
1 photo of Kochkarite associated with Quartz | SiO2 |
1 photo of Kochkarite associated with Monazite-(Ce) | Ce(PO4) |
Related Minerals - Strunz-mindat Grouping
2.GC. | Clogauite | PbBi4Te4S3 |
2.GC.05 | Hatchite | AgTlPbAs2S5 |
2.GC.05 | Wallisite | (Cu,Ag)TlPbAs2S5 |
2.GC.10 | Sinnerite | Cu6As4S9 |
2.GC.15 | Watanabeite | Cu4(As,Sb)2S5 |
2.GC.20 | Simonite | TlHgAs3S6 |
2.GC.25 | Quadratite | Ag(Cd,Pb)AsS3 |
2.GC.25 | Manganoquadratite | AgMnAsS3 |
2.GC.30 | Smithite | AgAsS2 |
2.GC.35 | Trechmannite | AgAsS2 |
2.GC.35 | Debattistiite | Ag9Hg0.5As6S12Te2 |
2.GC.40a | Aleksite | PbBi2Te2S2 |
2.GC.40c | Poubaite | PbBi2(Se,Te,S)4 |
2.GC.40c | Rucklidgeite | PbBi2Te4 |
2.GC.40e | Babkinite | Pb2Bi2(S,Se)3 |
2.GC.40d | Saddlebackite | Pb2Bi2Te2S3 |
2.GC.45 | Tvalchrelidzeite | Hg3SbAsS3 |
2.GC.50 | Mutnovskite | Pb4As2S6ICl |
Other Information
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 Kochkarite
mindat.org URL:
https://www.mindat.org/min-2234.html
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References for Kochkarite
Localities for Kochkarite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Austria | |
| Kolitsch et al. (2020) |
Canada | |
| Roberts (2017) |
Cuba | |
| Torró et al. (2016) |
Peru | |
| Alfonso et al. (2023) |
Russia | |
| Kasatkin et al. (2022) |
| Spiridonov et al. (1989) +1 other reference |
| Bortnikov et al. (2004) |
| Chernyavsky et al. (2012) +1 other reference |
| Pekov (1998) |
| Maslennikov et al. (2013) |
USA | |
| Heinrich et al. (2004) |
Quick NavTopAbout KochkariteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Kochkar' Au deposit, Plast, Plastovsky District, Chelyabinsk Oblast, Russia