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Poubaite Mineral Data
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General Poubaite Information
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 Chemical Formula: |
PbBi2Se2(Te,S)2 |
| Composition: |
Molecular Weight = 990.51 gm |
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Bismuth 42.20 % Bi |
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Tellurium 19.32 % Te |
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Lead 20.92 % Pb |
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Selenium 15.94 % Se |
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Sulfur 1.62 % S |
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______ |
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100.00 % |
| Empirical Formula: |
PbBi2Se2Te1.5S0.5 |
| Environment: |
In hydrothermal dolomite-calcite veins in the western contact of the Bor granite massif. |
| IMA Status: |
Approved IMA 1978 |
| Locality: |
Oldr�chov, Tachov, Cechy (Bohemia), Czech Republic. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Z. Pouba, economic geologist, Charles University, Prague, Czechoslovakia. |
| Name Pronunciation: |
Poubaite  |
| Synonym: |
ICSD 20386 |
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PDF 29-245 |
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Poubaite Image |
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Images:
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Poubaite Crystallography
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| Axial Ratios: |
a:c = 1:9.42968 |
| Cell Dimensions: |
a = 4.252, c = 40.095, Z = 3; V = 627.78 Den(Calc)= 7.86 |
| Crystal System: |
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.251(1), 3.093(0.4), 2.127(0.2), |
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Physical Properties of Poubaite
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| Cleavage: |
{0001} Perfect |
| Color: |
Silver white. |
| Diaphaneity: |
Opaque |
| Habit: |
Euhedral Crystals - Occurs as well-formed crystals showing good external form. |
| Habit: |
Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape. |
| Hardness: |
2.5-3 - Finger Nail-Calcite |
| Luster: |
Metallic |
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Optical Properties of Poubaite
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| Optical Data: |
NCalc= 2.18 - from Gladstone-Dale relationship (KC = 0.1505) where Ncalc=Dcalc*KC+1
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| RL Anisotrophism: |
Strong in light grayish. |
| RL Color: |
Creamy white. |
| RL Pleochroism: |
Maximum parallel to elongation, creamy. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Poubaite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 420 nm |
46.00 |
50.30 |
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| 440 nm |
46.50 |
51.40 |
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| 460 nm |
47.20 |
52.20 |
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| 480 nm |
47.60 |
52.70 |
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| 500 nm |
48.00 |
53.00 |
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| 520 nm |
48.30 |
53.20 |
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| 540 nm |
48.50 |
53.30 |
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| 560 nm |
48.60 |
53.30 |
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| 580 nm |
48.80 |
53.30 |
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| 600 nm |
48.80 |
53.30 |
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| 620 nm |
48.90 |
53.20 |
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| 640 nm |
49.00 |
53.20 |
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| 660 nm |
49.00 |
53.10 |
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| 680 nm |
49.10 |
53.10 |
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| 700 nm |
49.10 |
53.00 |
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Calculated Relative Intensity Colors of Poubaite in Air
Relative
Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
160% |
180% |
190% |
| R1 |
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| R2 |
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Calculated Properties of Poubaite
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| Electron Density: |
Bulk Density (Electron Density)=6.38 gm/cc
note: Specific Gravity of Poubaite =7.86 gm/cc.
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| Fermion Index: |
Fermion Index = 0.07
Boson Index = 0.93 |
| Photoelectric: |
PEPoubaite =1,319.09 barns/electron
U=PEPoubaite x rElectron Density=8,415.72 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Poubaite is Not Radioactive |
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Poubaite Classification
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| Dana Class: |
02.06.02.06 (02)Sulfides - Including Selenides and Tellurides |
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(02.06)where Am Bn Xp, with (m+n):p=4:3 |
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(02.06.02)Joseite Group (Trigonal: R-3m) |
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02.06.02.01 Joseite Bi4(S,Te)3 R 3m 3 2/m |
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02.06.02.02 Joseite-B Bi4(S,Te)3 R 3m 3 2/m |
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02.06.02.03 Ikunolite Bi4(S,Se)3 R 3m 3 2/m |
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02.06.02.04 Laitakarite Bi4(Se,S)3 R 3m 3 2/m |
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02.06.02.05 Pilsenite Bi4Te3 R 3m 3 2/m |
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02.06.02.06 Poubaite PbBi2Se2(Te,S)2 R 3m 3 2/m |
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02.06.02.07 Rucklidgeite (Bi,Pb)3Te4 R 3m 3 2/m |
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02.06.02.08 Babkinite! Pb2Bi2(S,Se)3 P 3,P 3m Trig |
| Strunz Class: |
02.GC.40c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.G - Sulfarsenites, sulfantimonites, sulfbismuthites |
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02.GC -Poly-sulfarsenites |
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02.GC.40c Rucklidgeite (Bi,Pb)3Te4 R 3m 3 2/m |
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02.GC.40c Poubaite PbBi2Se2(Te,S)2 R 3m 3 2/m |
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Other Poubaite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Poubaite :
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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Poubaite
PbBi2Se2(Te,S)2
Dana No: 02.06.02.06 Strunz No: 02.GC.40c
Locality:
Notes:
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