Gratonite Mineral Data + Say GRATONITE

General Gratonite Information

Help on Chemical  Formula: Chemical Formula: Pb9As4S15
Help on Composition: Composition: Molecular Weight = 2,645.48 gm
   Arsenic  11.33 %  As
   Lead     70.49 %  Pb
   Sulfur   18.18 %  S
           ______ 
           100.00 % 
Help on Empirical Formula: Empirical Formula: Pb9As4S15
Help on Environment: Environment: In vugs in hydrothermal copper ores.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1939
Help on Locality: Locality: In the Excelsior mine, Cerro de Pasco, Peru, in large crystals. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Louis Carly Graton (1880-1970), Professor of Economic Geology, Harvard University, Cambridge, Massachusetts, USA.
Help on Synonym: Synonym: ICSD 18097
  PDF 44-1412
 

Gratonite Image

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Gratonite

Comments: Crystal cluster of gratonite. The largest crystal is 2.5 mm across.
Location: Excelsior mine, Cerro de Pasco, Pasco dept., Peru. Scale: 1.5 x 1 cm.
© John Veevaert

Gratonite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.4402
Help on Cell Dimensions: Cell Dimensions: a = 17.701, c = 7.792, Z = 3; V = 2,114.34 Den(Calc)= 6.23
Help on Crystal System: Crystal System: Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.43(1), 3.75(0.6), 2.734(0.5),
Help on Forms: Forms:

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Forms: [ 1 0 1] [ 4 0 1] [ 0 0 1] [ 1 1 0] [ 1 0 0] [ 0 2 1]

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Ribar B , Nowacki W , Zeitschrift fur Kristallographie , 128 (1969) p.321-338, Neubestimmung der kristallstruktur von gratonit, Pb9As4S15, Locality: Wiesloch, Germany

 

Physical Properties of Gratonite

Help on Cleavage: Cleavage: None
Help on Color: Color: Lead gray, Dark lead gray.
Help on Density: Density: 6.22
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: black
 

Optical Properties of Gratonite

Help on RL Color: RL Color: White, distinctly yellow against galena.
Help on RL Pleochroism: RL Pleochroism: Very weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Gratonite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   36.90   37.80 
   
 420 nm   36.30   37.20 
 440 nm   35.70   36.60 
 460 nm   35.30   36.10 
 480 nm   35.10   35.70 
 500 nm   34.80   35.40 
 520 nm   34.50   35.00 
 540 nm   34.20   34.80 
 560 nm   34.10   34.60 
 580 nm   34.00   34.50 
 600 nm   33.90   34.50 
 620 nm   33.80   34.40 
 640 nm   33.70   34.20 
 660 nm   33.50   33.80 
 680 nm   33.00   33.40 
 700 nm   32.40   32.70 
Calculated Relative Intensity Colors of Gratonite in Air
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 260%
R1                      
R2                      
 

Calculated Properties of Gratonite

Help on Electron Density: Electron Density:

relectron=5.23 gm/cc
note: rGratonite =6.23 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.15714
Boson Index = 0.84286
Help on Photoelectric: Photoelectric:

PEGratonite =1,299.32 barns/electron
U=PEGratonite x relectron=6,792.88 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gratonite is Not Radioactive

 

Gratonite Classification

Help on  Dana Class: Dana Class: 3.3.2.1 (3)Sulfides - Sulfosalts
  (3.3)where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (3.3.2)Dana Group
 
3.3.2.1 Gratonite Pb9As4S15 R 3m 3m
Help on  Strunz Class: Strunz Class: II/E.15-30 II - Sulfides and sulphosalts
  II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts with Arsen and Antimon x = 3.8 - 3.1
  II/E.15 - Jordanite - Lengenbachite series
 
II/E.15-10 Jordanite Pb14(As,Sb)6S23 P 21/m 2/m
 
II/E.15-20 Geocronite Pb14(Sb,As)6S23 P 21/m 2/m
 
II/E.15-30 Gratonite Pb9As4S15 R 3m 3m
 
II/E.15-40 Meneghinite Pb13CuSb7S24 Pbnm 2/m 2/m 2/m
 
II/E.15-45 Tsugaruite! Pb4As2S7 Pba2 or Pbam Ortho
 
II/E.15-50 Lengenbachite Pb6(Ag,Cu)2As4S13 P1 or P1 Tri
 

Other Gratonite 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 Gratonite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 -Athena 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 - HyperPhysics 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 -École des Mines de Paris

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Gratonite

Pb9As4S15
Dana No: 3.3.2.1 Strunz No: II/E.15-30
Locality:

 

Notes:

 

 
   
 
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