Mineralogy Database

Vurroite Mineral Data

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General Vurroite Information

Help on Chemical Formula: Chemical Formula: Pb20Sn2(Bi,As)22S54Cl6
Help on Composition: Composition: Molecular Weight = 9,577.60 gm
   Thallium   0.06 %  Tl
   Tin        1.61 %  Sn
   Bismuth   28.34 %  Bi
   Arsenic    8.39 %  As
   Lead      41.00 %  Pb
   Selenium   0.18 %  Se
   Sulfur    18.32 %  S
   Bromine    0.24 %  Br
   Chlorine   1.85 %  Cl
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Pb18.95Sn1.3Bi12.99As10.73Tl0.03S54.71Se0.22Cl5Br0.29
Help on Environment: Environment: Assemblage of Pb-Bi sulfosalts encrusting high temperature (400-600 °C) fumaroles. OD (order-disorder) structure F2/d11 and A2/d11.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Rim and inner slope of the La Fossa crater of Vulcano Island, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Filippo Vurro, Professor of Mineralogy at the University of Bari and specialist in the mineralogy and geochemistry of modern volcanic deposits.
Help on Synonym: Synonym: IMA2003-027
 

Vurroite Image

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  Vurroite

Comments: SEM image of a jack-straw aggregate of vurroite crystals. (CanMin, v43:703).
Location: Fumarole (400-600 deg C) Pb-Bi epithermal deposit of La Fossa crater, on Vulcano Island, Italy. Scale: See Image.
© Canadian Mineralogist

Vurroite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.1839:1:0.5993
Help on Cell Dimensions: Cell Dimensions: a = 8.371, b = 45.502, c = 27.273, Z = 4; beta = 98.83° V = 10,265.09 Den(Calc)= 6.20
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.07(1)(18.2.8 ), 3.34(0.8)(822), 2.85(0.8)(16.0.2 ),2.69(0.8)(12.2.6 ), 2.1(0.7)(040), 3.17(0.6)(826), 2.17(0.6)(18.2.2 ), 2.04(0.5)(20.0.12), 3.71(0.45)(12.0.4 ),
 

Physical Properties of Vurroite

Help on Cleavage: Cleavage: Unknown
Help on Color: Color: Silvery gray.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Luster: Luster: Metallic
 

Optical Properties of Vurroite

Help on RL Anisotrophism: RL Anisotrophism: Weak.
Help on RL Bireflectance: RL Bireflectance: None.
Help on RL Color: RL Color: White with no internal reflections.
Help on RL Pleochroism: RL Pleochroism: None.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Vurroite in Air
λ R  ∑ R(λ) 
 470 nm   34.25   
 546 nm   32.95 
 589 nm   32.60 
 650 nm   31.05 
Calculated Relative Intensity Colors of Vurroite in Air
Relative
Intensity		    0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 270% 280%
R                        
 

Calculated Properties of Vurroite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.22 gm/cc
note: Specific Gravity of Vurroite =6.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEVurroite =1,303.82 barns/electron
U=PEVurroite x rElectron Density=6,805.44 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Vurroite is Not Radioactive
 

Vurroite Classification
Help on Dana Class: Dana Class: 03.06.23.01 (03)Sulfides - Sulfosalts
  (03.06)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.06.23)Dana Group
 
03.06.23.01 Vurroite! Pb20Sn2(Bi,As)22S54Cl6 C 2/c 2/m
Help on Strunz Class: Strunz Class: 02.JB.65 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.J - Sulfosalts of PbS Archetype
  02.JB -Galena derivatives, with Pb
 
02.JB.65 Vurroite! Pb20Sn2(Bi,As)22S54Cl6 C 2/c 2/m
 

Other Vurroite Information
Help on References: References: NAME( AmMin, v90, p1949) PHYS. PROP.(AmMin, v90,1949 - v93:713) OPTIC PROP.(AmMin, v90, p1949)
Help on See Also: See Also: Links to other databases for Vurroite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Vurroite

Pb20Sn2(Bi,As)22S54Cl6
Dana No: 03.06.23.01 Strunz No: 02.JB.65
Locality:

 

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