Mineralogy Database

Launayite Mineral Data

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General Launayite Information

Help on Chemical  Formula: Chemical Formula: Pb22Sb26S61
Help on Composition: Composition: Molecular Weight = 9,679.93 gm
   Antimony  32.70 %  Sb
   Lead      47.09 %  Pb
   Sulfur    20.21 %  S
            100.00 % 
Help on Empirical Formula: Empirical Formula: Pb22Sb26S61
Help on Environment: Environment: Hydrothermal vein mineral in marble.
Help on IMA Status: IMA Status: Approved IMA 1967
Help on Locality: Locality: Madoc, Ontario, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Louis de Launay (1860-1938), French student of mineral deposits.
Help on Name Pronunciation: Name Pronunciation: Launayite + Pronunciation Say LAUNAYITE
Help on Synonym: Synonym: IMA1966-021

Launayite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =10.6052:1:8.0099
Help on Cell Dimensions: Cell Dimensions: a = 42.58, b = 4.015, c = 32.16, Z = 2; beta = 102.017° V = 5,377.55 Den(Calc)= 5.98
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.45(1), 2.92(0.8), 4.17(0.8),

Physical Properties of Launayite

Help on Cleavage: Cleavage: {100} Perfect, {001} Perfect
Help on Color: Color: Lead gray.
Help on Density: Density: 5.75
Help on Diaphaneity: Diaphaneity: Opaque
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luster: Luster: Metallic
Help on Streak: Streak: black

Optical Properties of Launayite

Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on RL Pleochroism: RL Pleochroism: Fairly strong, from white to gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Launayite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   42.60   38.60 
 546 nm   43.80   36.90 
 589 nm   42.70   36.20 
 650 nm   40.90   35.50 
Calculated Relative Intensity Colors of Launayite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 250%

Calculated Properties of Launayite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.07 gm/cc
note: Specific Gravity of Launayite =5.98 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.1
Boson Index = 0.9
Help on Photoelectric: Photoelectric: PELaunayite = 966.70 barns/electron
U=PELaunayite x rElectron Density=4,904.23 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Launayite is Not Radioactive

Launayite Classification

Help on  Dana Class: Dana Class: (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
  (03.06.06)Dana Group Launayite Pb22Sb26S61 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.LB.50 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.L - Unclassified Sulfosalts
  02.LB -With essential Pb
02.LB.50 Launayite Pb22Sb26S61 C 2/m 2/m

Other Launayite 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 Launayite :
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.LB.50





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