Mineralogy Database

Cosalite Mineral Data

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General Cosalite Information

Help on Chemical  Formula: Chemical Formula: Pb2Bi2S5
Help on Composition: Composition: Molecular Weight = 992.69 gm
   Bismuth  42.10 %  Bi
   Lead     41.75 %  Pb
   Sulfur   16.15 %  S
           ______ 
           100.00 % 
Help on Empirical Formula: Empirical Formula: Pb2Bi2S5
Help on Environment: Environment: In moderate-tempurature hydrothermal deposits, contact metasomatic replacements, epithermal replacements and pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1868
Help on Locality: Locality: Silver Mine at Cosala, Sinaloa, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality. Bjelkite is named after the Bjelke mine at Nordmark, Vermland, Sweden.
Help on Name Pronunciation: Name Pronunciation: Cosalite Say COSALITE
Help on Synonym: Synonym: Bjelkite
  ICSD 30780
  PDF 42-1409
 

Cosalite Image

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  Cosalite

Comments: Metallic-lustered cosalite on matrix.
Location: Limestone Quarry, Hammerunterwiesenthal, Oberwiesenthal, Erzgebirge, Saxony, Germany. Scale: Picture size 8 mm.
© Thomas Witzke / Abraxas-Verlag

Cosalite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.799:1:0.1698
Help on Cell Dimensions: Cell Dimensions: a = 19.09, b = 23.89, c = 4.058, Z = 8; V = 1,850.69 Den(Calc)= 7.13
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.44(1), 2.81(0.3), 3.37(0.25),
Help on Forms: Forms:

Mouse
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RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

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I - Indicies
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F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 2 1 0) ( 1 2 0) ( 1 3 0) ( 1 0 0) ( 1 1 0) ( 6 3 2) ( 3 0 1)

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Physical Properties of Cosalite

Help on Cleavage: Cleavage: {010} Good
Help on Color: Color: Gray, Steel gray, Silver white.
Help on Density: Density: 6.4 - 6.8, Average = 6.6
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: black
 

Optical Properties of Cosalite

Help on RL Anisotrophism: RL Anisotrophism: Weak but distinct in oil.
Help on RL Color: RL Color: White with a trace of cream.
Help on RL Pleochroism: RL Pleochroism: Weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Cosalite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   46.90   49.70 
   
 420 nm   46.20   49.00 
 440 nm   45.50   48.30 
 460 nm   44.70   47.50 
 480 nm   43.90   46.70 
 500 nm   43.00   46.00 
 520 nm   42.20   45.20 
 540 nm   41.50   44.50 
 560 nm   41.00   44.00 
 580 nm   40.50   43.60 
 600 nm   40.20   43.50 
 620 nm   40.10   43.40 
 640 nm   40.00   43.30 
 660 nm   40.00   43.20 
 680 nm   39.90   43.20 
 700 nm   39.90   43.10 
Calculated Relative Intensity Colors of Cosalite in Air
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 210% 220%
R1                    
R2                    
 

Calculated Properties of Cosalite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.89 gm/cc
note: Specific Gravity of Cosalite =7.13 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PECosalite =1,597.07 barns/electron
U=PECosalite x rElectron Density=9,406.17 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cosalite is Not Radioactive
 

Cosalite Classification

Help on  Dana Class: Dana Class: 03.05.09.01 (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.JB.10 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.10 Cosalite Pb2Bi2S5 Pbnm 2/m 2/m 2/m
 

Other Cosalite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Cosalite :
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
15 - WWW-MINCRYST

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

Cosalite

Pb2Bi2S5
Dana No: 03.05.09.01 Strunz No: 02.JB.10
Locality:

 

Notes:

 

 
   
 


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