Pyrrhotite Mineral Data + Say PYRRHOTITE


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General Pyrrhotite Information
Help on Chemical Formula: Chemical Formula: Fe(1-x)S (x=0-0.17)
Help on Composition: Composition: Molecular Weight = 85.12 gm
   Iron    62.33 %  Fe
   Sulfur  37.67 %  S
          ______ 
          100.00 % 
Help on Empirical Formula: Empirical Formula: Fe2+0.95S
Help on Environment: Environment: Wide spread occurrences in igneous and metamorphic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1835
Help on Locality: Locality: Sudbury, Ontario, Canada and Santa Eulalia, Chihuahua, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, phrrhotes, "redness," in allusion to color.
Help on Synonym: Synonym: Magnetic pyrites
 

Pyrrhotite Image

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Pyrrhotite

Comments: Lustrous sharp crystals of pyrrhotite to 3.5 cm in size with minor sphalerite and chalcopyrite.
Location: Nikolaevskiy mine, Dal'negors, Primorskiy Kray, Russia. Scale: 4 x 5 x 5.5 cm.
© Dan Weinrich

Pyrrhotite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.8647:1:1.7299
Help on Cell Dimensions: Cell Dimensions: a = 12.811, b = 6.87, c = 11.885, Z = 26; beta = 117.3° V = 929.51 Den(Calc)= 3.95
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.057(1), 2.635(0.9), 2.966(0.9),
Help on Forms: Forms:

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

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Tokonami M , Nishiguchi K , Morimoto N , American Mineralogist , 57 (1972) p.1066-1080, Crystal structure of a monoclinic pyrrhotite (Fe7S8)

 

Physical Properties of Pyrrhotite

Help on Cleavage: Cleavage: [0001] Imperfect, [1120] Imperfect
Help on Color: Color: Bronze, Bronze red, Dark brown.
Help on Density: Density: 4.58 - 4.65, Average = 4.61
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Naturally strong
Help on Streak: Streak: gray black
 

Optical Properties of Pyrrhotite

Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on RL Pleochroism: RL Pleochroism: Weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Pyrrhotite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   27.90   31.00 
   
 420 nm   28.60   32.20 
 440 nm   29.40   33.60 
 460 nm   30.30   34.80 
 480 nm   31.40   36.20 
 500 nm   32.40   37.60 
 520 nm   33.40   38.60 
 540 nm   34.50   39.60 
 560 nm   35.50   40.40 
 580 nm   36.50   41.20 
 600 nm   37.40   42.00 
 620 nm   38.30   42.60 
 640 nm   39.10   43.00 
 660 nm   39.90   43.50 
 680 nm   40.70   43.90 
 700 nm   41.40   44.10 
Calculated Relative Intensity Colors of Pyrrhotite in Air
Relative
Intensity		    0%   40%   80% 100% 120% 160% 200% 240% 280% 300%
R1                    
R2                    
 

Calculated Properties of Pyrrhotite

Help on Electron Density: Electron Density:

relectron=3.78 gm/cc
note: rPyrrhotite =3.95 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.01603
Boson Index = 0.98397
Help on Photoelectric: Photoelectric:

PEPyrrhotite = 20.96 barns/electron
U=PEPyrrhotite x relectron= 79.17 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pyrrhotite is Not Radioactive
 

Pyrrhotite Classification
Help on Dana Class: Dana Class: 2.8.10.1 (2)Sulfides - Including Selenides and Tellurides
  (2.8)where Am Bn Xp, with (m+n):p=1:1
  (2.8.10)Dana Group
 
2.8.10.1 Pyrrhotite Fe(1-x)S(x=0-0.17) A2/a 2/m
 
2.8.10.2 Smythite (Fe,Ni)9S11or(Fe,Ni)13S16 R 3m 3 2/m
Help on Strunz Class: Strunz Class: II/C.19-20 II - Sulfides and sulphosalts
  II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1
  II/C.19 - Troilite - Pyrrhotite - Haideite series
 
II/C.19-10 Troilite FeS P 63/mmc 6/m 2/m 2/m
 
II/C.19-20 Pyrrhotite Fe(1-x)S(x=0-0.17) A2/a 2/m
 
II/C.19-25 Jaipurite* CoS P 63/mmc 6/m 2/m 2/m
 
II/C.19-30 Westerveldite (Fe,Ni,Co)As Pnam 2/m 2/m 2/m
 
II/C.19-40 Modderite (Co,Fe)As Pmcn 2/m 2/m 2/m
 
II/C.19-50 Smythite (Fe,Ni)9S11or(Fe,Ni)13S16 R 3m 3 2/m
 
II/C.19-60 Achavalite* FeSe P 63/mmc 6/m 2/m 2/m
 
II/C.19-70 Heideite (Fe,Cr)1x(Ti,Fe)2S4 I2/m 2/m
 

Other Pyrrhotite Information
Help on References: References: NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Pyrrhotite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Applied Mineralogy 6 -Athena 7 - Crocoite.com Mineral Locations 8 - EUROmin Project 9 - Franklin Minerals(Dunn) 10 - Franklin Minerals(Palache) 11 -Google Images 12 -Google Scholar 13 -Handbook of Mineralogy (UofA) 14 - HyperPhysics 15 -MinDAT 16 -MinMax(Deutsch) 17 -MinMax(English) 18 -Mineralienatlas (Deutsch) 19 - Minerals of Wisconsin 20 -NSDL Reciprocal Net (JAVA) 21 - Philatelic Mineralogy 22 -QUT Mineral Atlas 23 - Scandinavian mineral gallery 24 -University of Minnesota 25 - WWW-MINCRYST 26 -École des Mines de Paris

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Pyrrhotite

Fe(1-x)S (x=0-0.17)
Dana No: 2.8.10.1 Strunz No: II/C.19-20
Locality:

 

Notes:

 
 
   
 
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