Vrbaite Mineral Data

Vrbaite Mineral Data
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General Vrbaite Information

Help on Chemical Formula: Chemical Formula: Tl4Hg3Sb2As8S20
Help on Composition: Composition: Molecular Weight = 2,903.50 gm
   Thallium  28.16 %  Tl
   Mercury   20.73 %  Hg
   Antimony   8.39 %  Sb
   Arsenic   20.64 %  As
   Sulfur    22.09 %  S
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Tl4Hg3Sb2As8S20
Help on Environment: Environment: Intergrown with realgar and orpiment.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1912
Help on Locality: Locality: Allchar, near Rozsdan, northwest of Salonika, Macedonia, Greece. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Karl Vrba (1845-1922), Czech mineralogist.
Help on Name Pronunciation: Name Pronunciation: Vrbaite Say VRBAITE
Help on Synonym: Synonym: ICSD 15240
  PDF 20-1264
 

Vrbaite Image

Click Here for Larger Vrbaite Image in a New Browser Window Images:
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Vrbaite   Realgar

Comments: Black grain of vrbaite in red realgar matrix.
Location: Allchar, Roszdan, FYR Macedonia. Scale: Picture size 1.7 mm.
© Thomas Witzke / Abraxas-Verlag

Vrbaite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.5676:1:0.483
Help on Cell Dimensions: Cell Dimensions: a = 13.189, b = 23.235, c = 11.223, Z = 2; V = 3,439.25 Den(Calc)= 2.80
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C mca
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.04(1), 2.57(0.8), 3.33(0.8),
Help on Forms: Forms:

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Forms: ( 0 1 0) ( 3 3 1) ( 1 1 2) ( 1 1 1) ( 1 0 0)

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Click Here for Large Vrbaite Structure Window Crystal Structure:

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Ohmasa M , Nowacki W , Zeitschrift fur Kristallographie , 134 (1971) p.360-380, The crystal structure of vrbaite, Hg3Tl4As8Sb2S20, Locality: Allchar, Macedonia

 

Physical Properties of Vrbaite

Help on Cleavage: Cleavage: {010} Good
Help on Color: Color: Gray black, Dark red.
Help on Density: Density: 5.3 - 2.3, Average = 3.8
Help on Diaphaneity: Diaphaneity: Opaque to subtranslucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Pyramidal - Crystals are shaped like pyramids.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Metallic
Help on Streak: Streak: light red
 

Optical Properties of Vrbaite

Help on Optical Data: Optical Data: Biaxial (+), b=2.72
Help on RL Color: RL Color: Bluish white with red internal reflections, dark red in translucent thin splinters.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Vrbaite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   45.80   48.60 
   
 420 nm   42.00   44.60 
 440 nm   38.20   40.60 
 460 nm   35.70   38.20 
 480 nm   33.80   36.70 
 500 nm   32.20   35.30 
 520 nm   30.80   34.00 
 540 nm   29.60   32.50 
 560 nm   28.60   31.10 
 580 nm   28.00   30.00 
 600 nm   27.60   29.20 
 620 nm   27.30   28.80 
 640 nm   27.10   28.80 
 660 nm   26.80   28.60 
 680 nm   26.60   28.40 
 700 nm   26.40   28.00 
Calculated Relative Intensity Colors of Vrbaite in Air
Relative
Intensity		    0%   40%   80% 100% 120% 160% 200% 240% 280% 310%
R1                    
R2                    
 

Calculated Properties of Vrbaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.41 gm/cc
note: Specific Gravity of Vrbaite =2.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEVrbaite = 867.15 barns/electron
U=PEVrbaite x rElectron Density=2,090.60 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Vrbaite is Not Radioactive
 

Vrbaite Classification
Help on Dana Class: Dana Class: 03.07.15.01 (03)Sulfides - Sulfosalts
  (03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.07.15)Dana Group
 
03.07.15.01 Vrbaite Tl4Hg3Sb2As8S20 C mca 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 02.HF.20 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.H - Sulfosalts of SnS Archetype
  02.HF -With SnS and PbS archetype structure units
 
02.HF.20 Vrbaite Tl4Hg3Sb2As8S20 C mca 2/m 2/m 2/m
 

Other Vrbaite Information
Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Vrbaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Vrbaite

Tl4Hg3Sb2As8S20
Dana No: 03.07.15.01 Strunz No: 02.HF.20
Locality:

 

Notes: