Aleksite Mineral Data

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.

Search for Aleksite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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.

Diaphaniety:

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:

r_electron=6.16 gm/cc
note: r_Aleksite=7.57 gm/cc.

Fermion Index

Fermion Index = 0.07058
Boson Index = 0.92942

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Aleksite is Not Radioactive

Aleksite Classification

Dana Class:

2.6.3.2 (2)Sulfides - Including Selenides and Tellurides

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

(2.6.3)Dana Group

2.6.3.1 Kochkarite PbBi4Te7 P 3m1 3 2/m

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

2.6.3.3 Hedleyite Bi7Te3(?) R 3m 3 2/m

Strunz Class:

II/D.12-20 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.12 - Tetradymite group, Poubaite - Rucklidgeite series

II/D.12-10 Kochkarite PbBi4Te7 P 3m1 3 2/m

II/D.12-20 Aleksite PbBi2Te2S2(?) P 3m1 3 2/m

II/D.12-30 Poubaite PbBi2Se2(Te,S)2 R 3m 3 2/m

II/D.12-40 Platynite? (Bi,Pb)3(Se,S)4 R 3m 3 2/m

II/D.12-50 Rucklidgeite (Bi,Pb)3Te4 R 3m 3 2/m

II/D.12-55 Saddlebackite! Pb2Bi2Te2S3 Unk Hex

II/D.12-60 Babkinite! Pb2Bi2(S,Se)3 P 3,P 3m Trig

Other Aleksite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

Search for Aleksite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Aleksite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Aleksite Mineral Data :

Ask about Aleksite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Aleksite

PbBi2Te2S2 (?)
Dana No: 2.6.3.2 Strunz No: II/D.12-20
Locality:

Notes: