Mineralogy Database

Bernardite Mineral Data

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General Bernardite Information

Help on Chemical  Formula: Chemical Formula: Tl(As,Sb)5S8
Help on Composition: Composition: Molecular Weight = 952.59 gm
   Thallium  21.46 %  Tl
   Antimony  31.95 %  Sb
   Arsenic   19.66 %  As
   Sulfur    26.93 %  S
            100.00 % 
Help on Empirical Formula: Empirical Formula: TlAs2.5Sb2.5S8
Help on IMA Status: IMA Status: Approved IMA 1989
Help on Locality: Locality: Lengenbach, Binn, Switzerland; Allchar, Macedonia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Names in 1989 for Jan Bernard (b.1928), Czech mineralogist.
Help on Name Pronunciation: Name Pronunciation: Bernardite + Pronunciation Say BERNARDITE
Help on Synonym: Synonym: ICSD 63481
  PDF 46-1339

Bernardite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.9466:1:1.3373
Help on Cell Dimensions: Cell Dimensions: a = 15.647, b = 8.038, c = 10.75, Z = 4; beta = 91.27° V = 1,351.70 Den(Calc)= 4.68
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.06(1), 4.28(0.74), 4.46(0.65),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

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

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Physical Properties of Bernardite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 4.5
Help on Diaphaneity: Diaphaneity: Opaque
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: dark red

Calculated Properties of Bernardite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.12 gm/cc
note: Specific Gravity of Bernardite =4.68 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.002019714
Boson Index = 0.997980286
Help on Photoelectric: Photoelectric: PEBernardite = 481.57 barns/electron
U=PEBernardite x rElectron Density=1,982.63 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bernardite is Not Radioactive

Bernardite Classification

Help on  Dana Class: Dana Class: (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 Parapierrotite Tl(Sb,As)5S8 P 21/n 2/m Bernardite Tl(As,Sb)5S8 P 21/c 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.75,p1209,1990)
Help on See Also: 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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Dana No: Strunz No: 02.HD.50





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