Mineralogy Database

Gudmundite Mineral Data

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General Gudmundite Information

Help on Chemical  Formula: Chemical Formula: FeSbS
Help on Composition: Composition: Molecular Weight = 209.66 gm
   Iron      26.64 %  Fe
   Antimony  58.07 %  Sb
   Sulfur    15.29 %  S
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Fe3+SbS
Help on Environment: Environment: A late stage hydrothermal mineral formed in sulfide deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1928
Help on Locality: Locality: Gudmundstorp, Sala, V�stmanland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Gudmundite + Pronunciation Say GUDMUNDITE
Help on Synonym: Synonym: ICSD 24161
  PDF 8-104
 

Gudmundite Image

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  Gudmundite

Comments: Steel gray metallic crystalline gudmundite, tarnishing, massive in rock.
Location: Pezinock, Zapadoslovensky, Slovakia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gudmundite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.6868:1:1.1346
Help on Cell Dimensions: Cell Dimensions: a = 10.02, b = 5.94, c = 6.74, Z = 8; beta = 90° V = 401.16 Den(Calc)= 6.94
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.56(1), 1.912(0.8), 1.41(0.7),
Help on Forms: Forms:

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Help on Above

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

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Physical Properties of Gudmundite

Help on Cleavage: Cleavage: None
Help on Color: Color: Silvery white, Steel gray.
Help on Density: Density: 6.72
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luster: Luster: Metallic
Help on Streak: Streak: grayish black
 

Optical Properties of Gudmundite

Help on RL Anisotrophism: RL Anisotrophism: Strong, in yellow and red tints.
Help on RL Color: RL Color: Silver white to steel-gray.
Help on RL Pleochroism: RL Pleochroism: Distinct, in pure white and pinkish white.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Gudmundite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   45.10   52.60 
   
 420 nm   46.00   53.40 
 440 nm   46.90   54.20 
 460 nm   47.70   54.80 
 480 nm   48.30   55.30 
 500 nm   48.70   55.50 
 520 nm   49.30   55.50 
 540 nm   49.90   55.30 
 560 nm   50.40   55.10 
 580 nm   50.80   55.00 
 600 nm   51.10   54.70 
 620 nm   51.30   54.40 
 640 nm   51.50   54.00 
 660 nm   51.90   53.60 
 680 nm   52.40   53.10 
 700 nm   53.10   52.70 
Calculated Relative Intensity Colors of Gudmundite in Air
Relative
Intensity
   0%   20%   40%   60%   80% 100% 120% 140% 160% 180% 190%
R1                      
R2                      
 

Calculated Properties of Gudmundite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.16 gm/cc
note: Specific Gravity of Gudmundite =6.94 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0067940047
Boson Index = 0.9932059953
Help on Photoelectric: Photoelectric: PEGudmundite = 202.04 barns/electron
U=PEGudmundite x rElectron Density=1,243.90 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gudmundite is Not Radioactive
 

Gudmundite Classification

Help on  Dana Class: Dana Class: 02.12.04.02 (02)Sulfides - Including Selenides and Tellurides
  (02.12)where Am Bn Xp, with (m+n):p=1:2
  (02.12.04)Arsenopyrite Group (Monoclinic: P21/c (Pseudo-orthorhombic))
 
02.12.04.01 Arsenopyrite FeAsS P 21/c 2/m
 
02.12.04.02 Gudmundite FeSbS P 21/n 2/m
 
02.12.04.03 Osarsite (Os,Ru)AsS P 21/c 2/m
 
02.12.04.04 Ruarsite RuAsS P 21/c 2/m
 
02.12.04.05 Iridarsenite (Ir,Ru)As2 P 21/c 2/m
 
02.12.04.06 Clinosafflorite (Co,Fe,Ni)As2 P 21/n 2/m
Help on  Strunz Class: Strunz Class: 02.EB.20 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.E - Metal Sulfides, M:S � 1:2
  02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc.
 
02.EB.20 Arsenopyrite FeAsS P 21/c 2/m
 
02.EB.20 Gudmundite FeSbS P 21/n 2/m
 
02.EB.20 Ruarsite RuAsS P 21/c 2/m
 
02.EB.20 Paxite CuAs2 P 21/c 2/m
 
02.EB.20 Osarsite (Os,Ru)AsS P 21/c 2/m
 

Other Gudmundite 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 Gudmundite :
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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Gudmundite

FeSbS
Dana No: 02.12.04.02 Strunz No: 02.EB.20
Locality:

 

Notes:

 

 
   
 


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