Bernardite Mineral Data

General Bernardite Information

Chemical Formula:

Tl(As,Sb)5S8

Composition:

Molecular Weight = 952.59 gm

Thallium 21.46 % Tl

Antimony 31.95 % Sb

Arsenic 19.66 % As

Sulfur 26.93 % S

______

100.00 %

Empirical Formula:

TlAs_2.5Sb_2.5S₈

IMA Status:

Approved IMA 1989

Locality:

Lengenbach, Binn, Switzerland; Allchar, Macedonia. Link to MinDat.org Location Data.

Name Origin:

Names in 1989 for Jan Bernard (b.1928), Czech mineralogist.

Name Pronunciation:

Bernardite + Pronunciation

Synonym:

ICSD 63481

PDF 46-1339

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Bernardite Crystallography

Axial Ratios:

a:b:c =1.9466:1:1.3373

Cell Dimensions:

a = 15.647, b = 8.038, c = 10.75, Z = 4; beta = 91.27° V = 1,351.70 Den(Calc)= 4.68

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 3.06(1), 4.28(0.74), 4.46(0.65),

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Forms: ( 0 1 2) ( 2 1 0) ( 2 0 1) ( 1 0 0)

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Crystal Structure:

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Pasava J , Pertlik F , Stumpfl E F , Zemann J , Mineralogical Magazine , 53 (1989) p.531-538, Bernardite, a new thallium arsenic sulphosalt from Allchar,, Macedonia, with a determination of the crystal structure, Locality: Allchar, Macedonia

Physical Properties of Bernardite

Cleavage:

None

Color:

Black.

Density:

4.5

Diaphaneity:

Opaque

Hardness:

2 - Gypsum

Luster:

Earthy (Dull)

Streak:

dark red

Calculated Properties of Bernardite

Electron Density:

Bulk Density (Electron Density)=4.12 gm/cc
note: Specific Gravity of Bernardite =4.68 gm/cc.

Fermion Index:

Fermion Index = 0.002019714
Boson Index = 0.997980286

Photoelectric:

PE_Bernardite= 481.57 barns/electron
U=PE_Bernardite x rElectron Density=1,982.63 barns/cc.

Radioactivity:

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

Bernardite Classification

Dana Class:

03.08.14.02 (03)Sulfides - Sulfosalts

(03.08)where 1 < z/y <2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.08.14)Dana Group

03.08.14.01 Parapierrotite Tl(Sb,As)5S8 P 2₁/n 2/m

03.08.14.02 Bernardite Tl(As,Sb)5S8 P 2₁/c 2/m

Strunz Class:

02.HD.50 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.H - Sulfosalts of SnS Archetype

02.HD -With Tl

02.HD.50 Bernardite Tl(As,Sb)5S8 P 2₁/c 2/m

Other Bernardite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.75,p1209,1990)

See Also:

Links to other databases for Bernardite :
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 Bernardite Specimen Label here :

Bernardite

Tl(As,Sb)5S8
Dana No: 03.08.14.02 Strunz No: 02.HD.50
Locality:

Notes: