Vote for your favorite mineral in #MinCup26! - Cuprite vs. Halite
While externally similar shapes, these two minerals are very different inside.
Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic TimeExplore Fossils
Minerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

UM1995-26-S:BiPbTe

Valid as an unnamed mineral
This page is currently not sponsored. Click here to sponsor this page.
Formula:
Pb2Bi3Te2S3
Colour:
silvery-gray
Lustre:
Metallic
Specific Gravity:
7.65
Crystal System:
Trigonal
One of 5 similar species co-described, the other 4 being UM1995-25-S:BiPbTe, UM1995-27-S:BiPbTe, UM1995-28-S:BiPbTe, and UM1995-29-S:BiPbTe.

Found in form of lamellar and tabular grains, up to 20 x 20 x 4 mm in size. Either resides in galena and calcite, or is intergrown with aleksite, pyrrhotite, and gold.

Electron microprobe analysis results (wt.%, mean of 2): Bi 36.87, Pb 33.57, Te 20.79, S 8.20, Sb 0.31, Ag 0.04, total 99.78. This corresponds to Pb1.92Bi2.09Sb0.03Te1.93S3.03.


Hide all sections | Show all sections

Unique IdentifiersHide

Mindat ID:
53619
Long-form identifier:
mindat:1:1:53619:4

Similar NamesHide

UM1970-21-S:BiPbTe(Bi,Pb)3Te2S2
UM1972-11-S:BiPbTePbBiTeS
UM1974-28-S:BiPbTe
UM1974-29-S:BiPbTe(Bi,Pb)5TeS5
UM1983-09-S:BiPbTePbBi3S2Te
UM1986-39-S:AuBiPbTe~Au(Pb,Cu)2(Bi,Sb,As,Se)Te2S3
UM1986-41-S:BiPbTe~ (Pb,Cu,Fe)10Bi8(Te,Se)4S11
UM1987-16-Se:BiPbTe(Bi,Pb)2(Se,Te,S)3
UM1995-25-S:BiPbTePb2Bi2TeS3
UM1995-27-S:BiPbTe Pb2Bi5Te5S2
UM1995-28-S:BiPbTe PbBi4Te2S2
UM1995-29-S:BiPbTePbBi4Te3S
UM2007-23-S:BiPbTePb3Bi4Te4S5
UM2007-24-S:BiPbTePb5Bi4Te4S7
UM2007-25-S:BiPbTePb3Bi2Te2S4

IMA Classification of UM1995-26-S:BiPbTeHide

IMA status notes:
Unnamed (probably valid)

Physical Properties of UM1995-26-S:BiPbTeHide

Lustre:
Metallic
Colour:
Silvery-gray
Hardness:
VHN100=19 - 94 - Vickers
Comment:
VHN5-15; mean VHN: 45
Density:
7.65(5) g/cm3 (Measured)    

Optical Data of UM1995-26-S:BiPbTeHide

Anisotropism:
strong
Bireflectance:
weak to moderate
Reflectivity:
WavelengthR1 (%)R2 (%)
440nm46.8% 40.6%
480nm46.4% 43.6%
520nm46.8% 46.4%
560nm47.3% 47.9%
600nm47.7% 48.7%
640nm47.9% 49.3%
680nm48.1% 49.9%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 49.9%.
R1 shown in black, R2 shown in red
Colour in reflected light:
white with a grayish brown tint

Chemistry of UM1995-26-S:BiPbTeHide

Mindat Formula:
Pb2Bi3Te2S3
Element Weights:
Element% weight
Bi45.015 %
Pb29.754 %
Te18.324 %
S6.907 %

Calculated from ideal end-member formula.
Elements listed:
Bi, Pb, S, Te - search for minerals with similar chemistry

Crystallography of UM1995-26-S:BiPbTeHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3m1
Setting:
P3m1
Cell Parameters:
a = 4.247(1) Å, c = 97.97(2) Å
Ratio:
a:c = 1 : 23.068
Unit Cell V:
1,530.34 ų (Calculated from Unit Cell)
Z:
6

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.26 Å(20- 30)
3.93 Å(20)
3.21 Å(20)
3.05 Å(100)
2.44 Å(20)
2.19 Å(40)
2.11 Å(30)
1.99 Å(20)
1.78 Å(20)
1.74 Å(30)
1.520 Å(20)
Locality:
Kochkar' Au deposit, Plast, Plastovsky District, Chelyabinsk Oblast, Russia

Other InformationHide

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 UM1995-26-S:BiPbTeHide

References for UM1995-26-S:BiPbTeHide

Localities for UM1995-26-S:BiPbTeHide

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.
Russia
 
  • Chelyabinsk Oblast
    • Plastovsky District
      • Plast
Spiridonov (1995) +1 other reference
Quick NavTopUnique IdentifiersSimilar NamesIMA Classification Physical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionOther InformationInternet Links References Localities Locality List
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: September 29, 2026 02:58:07 Page updated: January 4, 2026 02:00:24
Go to top of page