Bernardite Mineral Data

Bernardite Mineral Data +

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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.

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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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

Diaphaniety:

Opaque

Hardness:

2 - Gypsum

Luster:

Earthy (Dull)

Streak:

dark red

Calculated Properties of Bernardite

Electron Density:

r_electron=4.12 gm/cc
note: r_Bernardite=4.68 gm/cc.

Fermion Index

Fermion Index = 0.00201
Boson Index = 0.99799

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bernardite is Not Radioactive

Bernardite Classification

Dana Class:

3.8.14.2 (3)Sulfides - Sulfosalts

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

(3.8.14)Dana Group

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

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

Strunz Class:

II/E.14-20 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Sulfosalts with predominant Thallium and Mercury, x = 4.0 - 1.6

II/E.14 - Rebulite - Chabourneite series

II/E.14-10 Rebulite Tl5Sb5As8S22 P 2₁/c 2/m

II/E.14-12 Jankovicite Tl5Sb9(As,Sb)4S22 P1 1

II/E.14-15 Imhofite Tl6CuAs16S40 P 2₁/n 2/m

II/E.14-20 Bernardite Tl(As,Sb)5S8 P 2₁/c 2/m

II/E.14-25 Gillulyite Tl2(As,Sb)8S13 P 2/n 2/m

II/E.14-30 Pierrotite Tl2Sb6As4S16 P na2₁ mm2

II/E.14-40 Parapierrotite Tl(Sb,As)5S8 P 2₁/n 2/m

II/E.14-50 Chabourneite (Tl,Pb)21(Sb,As)91S147 P1 1

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Bernardite

Tl(As,Sb)5S8
Dana No: 3.8.14.2 Strunz No: II/E.14-20
Locality:

Notes: