Mineralogy Database

Dufrenoysite Mineral Data

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General Dufrenoysite Information

Help on Chemical  Formula: Chemical Formula: Pb2As2S5
Help on Composition: Composition: Molecular Weight = 724.57 gm
   Arsenic  20.68 %  As
   Lead     57.19 %  Pb
   Sulfur   22.13 %  S
           ______ 
           100.00 % 
Help on Empirical Formula: Empirical Formula: Pb2As2S5
Help on Environment: Environment: An uncommon mineral of moderate to low-temperature hydrothermal origin.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1845
Help on Locality: Locality: Binnental, Valais, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Ours Pierre Armand Petit Dufrenoy (1792-1857), French mineralogist, National School of Mines, Paris, France.
Help on Name Pronunciation: Name Pronunciation: Dufrenoysite + Pronunciation Say DUFRENOYSITE
Help on Synonym: Synonym: ICSD 18122
  PDF 10-453
  Rathite-1a - dufrenoysite
  Rathite-I - Rathite or dufrenoysite
 

Dufrenoysite Image

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  Dufrenoysite

Comments: Black prismatic crystal of Dufrenoysite with brassy yellow pyrite on succroidal dolomite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Dufrenoysite

Comments: Single, black dufrénoysite crystal in a vug in white dolomite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Crystal size 2.5 mm.
© Walter Gabriel

Dufrenoysite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3253:1:0.3048
Help on Cell Dimensions: Cell Dimensions: a = 8.41, b = 25.85, c = 7.88, Z = 8; beta = 90.5° V = 1,713.03 Den(Calc)= 5.62
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.74(1), 3(0.9), 2.7(0.8),
Help on Forms: Forms:

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Help on Above

Forms: ( 0 5 2) ( 2 3 2) ( 0 1 0) ( 0 1 1) ( 2 1 0) ( 2 1 2) ( 1 2 1) ( 0 2 1) ( 2 3 0) ( 2 3 2) ( 1 0 0) ( 1 1 0) ( 1 0 1) ( 1 2 0) ( 0 0 1)

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Physical Properties of Dufrenoysite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Lead gray, Gray, Steel gray.
Help on Density: Density: 5.55 - 5.57, Average = 5.56
Help on Diaphaneity: Diaphaneity: Subtranslucent to opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: red brown
 

Optical Properties of Dufrenoysite

Help on Optical Data: Optical Data: Biaxial (?), b=2.71
Help on Pleochroism (y): Pleochroism (y): dark brownish red.
Help on RL Anisotrophism: RL Anisotrophism: Strong, in brown-violet and dark green colors.
Help on RL Color: RL Color: White, sometimes showing deep red internal reflections.
Help on RL Pleochroism: RL Pleochroism: Very weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Dufrenoysite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   38.70   42.10 
   
 420 nm   38.50   41.90 
 440 nm   38.30   41.70 
 460 nm   38.00   41.40 
 480 nm   37.70   41.00 
 500 nm   37.30   40.60 
 520 nm   36.90   40.10 
 540 nm   36.30   39.60 
 560 nm   35.70   38.90 
 580 nm   35.00   38.00 
 600 nm   34.00   37.10 
 620 nm   33.20   36.10 
 640 nm   32.30   35.20 
 660 nm   31.60   34.30 
 680 nm   30.90   33.50 
 700 nm   30.30   32.70 
Calculated Relative Intensity Colors of Dufrenoysite in Air
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 270%
R1                      
R2                      
 

Calculated Properties of Dufrenoysite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.81 gm/cc
note: Specific Gravity of Dufrenoysite =5.62 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.12
Boson Index = 0.88
Help on Photoelectric: Photoelectric: PEDufrenoysite =1,042.99 barns/electron
U=PEDufrenoysite x rElectron Density=5,015.65 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dufrenoysite is Not Radioactive
 

Dufrenoysite Classification

Help on  Dana Class: Dana Class: 03.05.09.03 (03)Sulfides - Sulfosalts
  (03.05)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.05.09)Cosalite Group
 
03.05.09.01 Cosalite Pb2Bi2S5 Pbnm 2/m 2/m 2/m
 
03.05.09.02 Veenite Pb2(Sb,As)2S5 P 21cn mm2
 
03.05.09.03 Dufrenoysite Pb2As2S5 P 21/m 2/m
Help on  Strunz Class: Strunz Class: 02.HC.05d 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.H - Sulfosalts of SnS Archetype
  02.HC -With only Pb
 
02.HC.05d Dufrenoysite Pb2As2S5 P 21/m 2/m
 
02.HC.05d Rathite Pb8Pb4-x(Tl2As2)x(Ag2As2)As16S40 P 21/n 2/m
 
02.HC.05d Veenite Pb2(Sb,As)2S5 P 21cn mm2
 

Other Dufrenoysite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Dufrenoysite :
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 - HyperPhysics
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Dufrenoysite

Pb2As2S5
Dana No: 03.05.09.03 Strunz No: 02.HC.05d
Locality:

 

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