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Aleksite Mineral Data
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General Aleksite Information
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 Chemical Formula: |
PbBi2Te2S2 (?) |
| Composition: |
Molecular Weight = 944.49 gm |
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Bismuth 44.25 % Bi |
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Tellurium 27.02 % Te |
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Lead 21.94 % Pb |
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Sulfur 6.79 % S |
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______ |
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100.00 % |
| Empirical Formula: |
PbBi2Te2S2 |
| Environment: |
Of hydrothermal origin. |
| IMA Status: |
Approved IMA 1978 |
| Locality: |
In the Alekseev mine, Sutemskii region, Stanovoi Range, Russia. Link to MinDat.org Location Data. |
| Name Origin: |
Named after the locality. |
| Name Pronunciation: |
Aleksite  |
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Aleksite Image |
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Images:
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Aleksite
Comments: Gray, metallic aleskite grains in quartz with tellurobismuthite and Pb-bearing tetradymite.
Location: St. David's Mine, Bontddu, Dogellau, Gwynedd, Wales, UK.
Scale: Specimen Size 2.5x4.5 cm.
© Diederik Visser |
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Aleksite Crystallography
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| Axial Ratios: |
a:c = 1:18.79405 |
| Cell Dimensions: |
a = 4.2423, c = 79.73, Z = 6; V = 1,242.67 Den(Calc)= 7.57 |
| Crystal System: |
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.09(1), 2.12(0.6), 2.25(0.4), |
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Physical Properties of Aleksite
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| Cleavage: |
{???} Perfect |
| Color: |
Steel gray. |
| Diaphaneity: |
Opaque |
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
| Hardness: |
2.5 - Finger Nail |
| Luster: |
Metallic |
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Optical Properties of Aleksite
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| RL Anisotrophism: |
Weak. |
| RL Color: |
Light pale gray with slight greenish tint. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Aleksite in Air
| λ |
R |
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∑ R(λ) |
| 460 nm |
51.40 |
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| 480 nm |
51.80 |
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| 500 nm |
52.70 |
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| 520 nm |
52.80 |
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| 540 nm |
53.20 |
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| 560 nm |
53.10 |
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| 580 nm |
53.40 |
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| 600 nm |
53.90 |
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| 620 nm |
53.90 |
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| 640 nm |
54.20 |
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| 660 nm |
54.50 |
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| 680 nm |
54.40 |
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| 700 nm |
54.90 |
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Calculated Relative Intensity Colors of Aleksite in Air
Relative
Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
160% |
170% |
| R |
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Calculated Properties of Aleksite
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| Electron Density: |
Bulk Density (Electron Density)=6.16 gm/cc
note: Specific Gravity of Aleksite =7.57 gm/cc.
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| Fermion Index: |
Fermion Index = 0.07
Boson Index = 0.93 |
| Photoelectric: |
PEAleksite =1,392.30 barns/electron
U=PEAleksite x rElectron Density=8,570.21 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Aleksite is Not Radioactive |
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Aleksite Classification
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| Dana Class: |
02.06.03.02 (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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(02.06.03)Kochkarite Group |
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02.06.03.01 Kochkarite PbBi4Te7 P 3m1 3 2/m |
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02.06.03.02 Aleksite PbBi2Te2S2(?) P 3m1 3 2/m |
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02.06.03.03 Hedleyite Bi7Te3(?) R 3m 3 2/m |
| Strunz Class: |
02.GC.40a 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.40a Aleksite PbBi2Te2S2(?) P 3m1 3 2/m |
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Other Aleksite 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 Aleksite :
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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Aleksite
PbBi2Te2S2 (?)
Dana No: 02.06.03.02 Strunz No: 02.GC.40a
Locality:
Notes:
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