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Aleksite (Aleksit)

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Aleksit
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Aleksit
schwarze Flächen eines Anschliffes von Aleksit neben unbekannten Mineralen, Kotschkar, Tscheljabinsk, Russland; BB ~ 1 mm, analysiert mittels EMPA
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Russland/Ural, Föderationskreis/Tscheljabinsk (Chelyabinsk), Oblast/Plast, Rajon/Kotschkar (Kochkar')
Mineral: Aleksite
Image: 1584362505
License: Usage for Mineralienatlas project only
Aleksit  W
Analysed with wavelength-dispersive X-ray WDS

schwarze Flächen eines Anschliffes von Aleksit neben unbekannten Mineralen, Kotschkar, Tscheljabinsk, Russland; BB 1 mm, analysiert mittels EMPA
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-03-16
Locality: Kotschkar (Kochkar') / Plast, Rajon / Tscheljabinsk (Chelyabinsk), Oblast / Ural, Föderationskreis / Russland

Collectors Summary

Color grau
Lustre Metallglanz
Hardness (Mohs) 2.5
Cleavages vollkommen {0001}
Crystal System hexagonal,

Chemism

Chemical formula

PbBi2Te2S2

Chemical composition

Bismut, Blei, Tellur, Schwefel

Unit weight: 944.507764 u; Number of atoms in the formula: 7

Info

Empirical formula:

PbBi2Te2S2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Sulfur

S

6.79

2

28.57

32.0655000

64.1310000
Tellurium

Te

27.02

2

28.57

127.6030000

255.2060000
Lead

Pb

21.94

1

14.29

207.2100000

207.2100000
Bismuth

Bi

44.25

2

28.57

208.9803820

417.9607640

Analysis wt%

Ø Pb : 20.40, Bi : 45.80, Te : 27.30, S : 6.30 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 78)

Strunz 9th edition incl. updates

2.DC.05

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfoarsenide, Sulfoantimonide, Sulfobismuthide)
D: Metallsulfide mit M:S = 3:4 und 2:3
C: M:S variabel
05:Tetradymit-Gruppe

Lapis Classification

II/D.12-020

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
D: Sulfide mit Metall : S,Se,Te < 1:1

Classification by Hölzel

2.DC.520

2: SULFIDES
D: With Me/S <1/1 and >1/2
C: Me/S Variable
5: Poubaite-Group

Hey's Chemical Index of Minerals

03.07.39

03: Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
07: Sulphides etc. of V, As, Sb and Bi

Dana 8th edition

02.06.03.02

02: Sulfide Minerals
06: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=4:3
03: Kochkarite Group

IMA status

anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Aleksite group

Optical Properties

Color

grau

Change in color

auf polierten Flächen sehr hellgrau mit leichtem Grünstich

Lustre

Metallglanz

Anisotropism

schwach

Reflectivity: (Lambda nm) ↓, ↑, Ø

(460) 51.40, , 51.40
(480) 51.80, , 51.80
(500) 52.70, , 52.70
(520) 52.80, , 52.80
(540) 53.20, , 53.20
(560) 53.10, , 53.10
(580) 53.40, , 53.40
(600) 53.90, , 53.90
(620) 53.90, , 53.90
(640) 54.20, , 54.20
(660) 54.50, , 54.50
(680) 54.40, , 54.40
(700) 54.90, , 54.90
Reflection chart Aleksite

Reflectivity Ø

53.4

Crystallography

Crystal System

hexagonal

Cell parameters a (Å)

4.238

Cell parameters b (Å)

-

Cell parameters c (Å)

79.76

Cell parameters a/b or c/a

18.820!

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

6

Volume (ų)

1240.617

X-Ray Powder Diffraction

3.63(30),
3.09(100),
2.25(40),
2.12(60),
1.974(30),
1.748(30),
1.348(40),
1.307(40)
XRD chart Aleksite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

2.5

VHN (Hardness Vickers)

40 - 65, 51 (20g)

Density (g/cm³)

7.80 (berechnet)

7.585 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {0001}

(Co-)Type locality

(Co-)Type locality

Russland/Ferner Osten, Föderationskreis/Sacha (Sakha, Jakutien, Якутия), Republik/Stanovoi-Gebirge/Sutamskii-Gebiet/Alekseevskoye Au Mine

Type material

Gosudarst University, Moskau, Russland;

Moscow University, Moskau, Russland;

A.E. Fersman Mineralogical Museum, Academy of Sciences, Moskau, Russland,

Collection number of type material

79060 (Fersman)

Preface

Name from

der Typlokalität Alekseevskoye Mine in Russland

Author (Name, Year)

Lipovetskiy & Borodaev & Zav'yalov, 1978

References

American Mineralogist: 64: 652.

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva and Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 107: 315-321.

Strunz Mineralogical Tables 9. Edition (2001)

IMA group assignments

Other languages

German

Aleksit

Spanish

Aleksita

English

Aleksite

French

Aleksite

Russian

Алексит

Traditional Chinese

硫碲鉍鉛礦

Simplified Chinese

硫碲铋铅矿

CNMNC (IMA)-Number

IMA 1977-038

CNMNC symbol

Symbol

Alk

Locations with GPS information

IDs

GUSID (Global unique identifier short form) DaTxECXkGk6WXsLxPBqqdQ
GUID (Global unique identifier) 10F1A40D-E425-4E1A-965E-C2F13C1AAA75
Database ID 54