Mineralogy Database

Gudmundite Mineral Data

Search Webmineral :

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

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


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:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

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

Warning: this java applet does not work in some browsers because of security restrictions.


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
   0%   20%   40%   60%   80% 100% 120% 140% 160% 180% 190%

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)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)) Arsenopyrite FeAsS P 21/c 2/m Gudmundite FeSbS P 21/n 2/m Osarsite (Os,Ru)AsS P 21/c 2/m Ruarsite RuAsS P 21/c 2/m Iridarsenite (Ir,Ru)As2 P 21/c 2/m 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

Search for Gudmundite using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Gudmundite :

Ask about Gudmundite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

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


Dana No: Strunz No: 02.EB.20





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.