Aleksite Mineral Data

General Aleksite Information

Chemical Formula:

PbBi2Te2S2 (?)

Composition:

Molecular Weight = 944.49 gm

Bismuth 44.25 % Bi

Tellurium 27.02 % Te

Lead 21.94 % Pb

Sulfur 6.79 % S

______

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

Aleksite Image

Images:

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

Aleksite Crystallography

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 ScalenohedralH-M Symbol (3 2/m) Space Group: P 3m1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.09(1), 2.12(0.6), 2.25(0.4),

Physical Properties of Aleksite

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

Optical Properties of Aleksite

RL Anisotrophism:

Weak.

RL Color:

Light pale gray with slight greenish tint.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Aleksite in Air**
λ	R	∑ R(λ)
460 nm	51.40
480 nm	51.80
500 nm	52.70
520 nm	52.80
540 nm	53.20
560 nm	53.10
580 nm	53.40
600 nm	53.90
620 nm	53.90
640 nm	54.20
660 nm	54.50
680 nm	54.40
700 nm	54.90

**Calculated Relative Intensity Colors of Aleksite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	170%
R

Calculated Properties of Aleksite

Electron Density:

Bulk Density (Electron Density)=6.16 gm/cc
note: Specific Gravity of Aleksite =7.57 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Aleksite=1,392.30 barns/electron
U=PE_Aleksite x rElectron Density=8,570.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Aleksite is Not Radioactive

Aleksite Classification

Dana Class:

02.06.03.02 (02)Sulfides - Including Selenides and Tellurides

(02.06)where Am Bn Xp, with (m+n):p=4:3

(02.06.03)Kochkarite Group

02.06.03.01 Kochkarite PbBi4Te7 P 3m1 3 2/m

02.06.03.02 Aleksite PbBi2Te2S2(?) P 3m1 3 2/m

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

02.G - Sulfarsenites, sulfantimonites, sulfbismuthites

02.GC -Poly-sulfarsenites

02.GC.40a Aleksite PbBi2Te2S2(?) P 3m1 3 2/m

Other Aleksite Information

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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Print or Cut-and-Paste your Aleksite Specimen Label here :

Aleksite

PbBi2Te2S2 (?)
Dana No: 02.06.03.02 Strunz No: 02.GC.40a
Locality:

Notes: