Mineralogy Database

Frohbergite Mineral Data

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General Frohbergite Information

Help on Chemical  Formula: Chemical Formula: FeTe2
Help on Composition: Composition: Molecular Weight = 311.05 gm
   Iron       17.95 %  Fe
   Tellurium  82.05 %  Te
             100.00 % 
Help on Empirical Formula: Empirical Formula: Fe2+Te2
Help on Environment: Environment: In hydrothermal ore deposits, rimming chalcopyrite grains, and as inclusions in gold, petzite, or chalcopyrite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1947
Help on Locality: Locality: From the Robb-Montbray and Oranda mines, Quebec. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Dr. Max Hans Frohberg, mining geologist, Toronto, Canada.
Help on Name Pronunciation: Name Pronunciation: Frohbergite + Pronunciation Say FROHBERGITE
Help on Synonym: Synonym: ICSD 25679
  PDF 14-419

Frohbergite Image

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Comments: Irregular black mssses of frohbergite in quartzite matrix.
Location: San Simon Basin (San Simon River; Bowie Chabazite deposit), Bowie area, Cochise Co., Arizona, USA. Scale: Picture Size 2.5 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Frohbergite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8434:1:0.615
Help on Cell Dimensions: Cell Dimensions: a = 5.28, b = 6.26, c = 3.85, Z = 2; V = 127.25 Den(Calc)= 8.12
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.81(1), 2.71(0.7), 2.07(0.5),

Physical Properties of Frohbergite

Help on Cleavage: Cleavage: None
Help on Color: Color: Silver white, Tin white.
Help on Density: Density: 8.055
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Metallic

Optical Properties of Frohbergite

Help on RL Anisotrophism: RL Anisotrophism: Strong, orange-red to inky blue.
Help on RL Color: RL Color: White with bluish or pinkish tint.
Help on RL Pleochroism: RL Pleochroism: Extremely weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Frohbergite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   56.70   57.10 
 420 nm   54.80   56.20 
 440 nm   52.90   55.30 
 460 nm   51.90   54.50 
 480 nm   51.10   53.80 
 500 nm   50.60   53.10 
 520 nm   50.10   52.60 
 540 nm   50.00   52.40 
 560 nm   50.20   52.50 
 580 nm   50.70   53.00 
 600 nm   51.40   53.80 
 620 nm   52.20   54.50 
 640 nm   53.00   55.40 
 660 nm   53.90   56.30 
 680 nm   55.00   57.40 
 700 nm   56.20   58.50 
Calculated Relative Intensity Colors of Frohbergite in Air
   0%   20%   40%   60%   80% 100% 120% 140% 160% 180%

Calculated Properties of Frohbergite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.79 gm/cc
note: Specific Gravity of Frohbergite =8.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEFrohbergite = 307.26 barns/electron
U=PEFrohbergite x rElectron Density=2,085.49 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Frohbergite is Not Radioactive

Frohbergite 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
  (02.12.02)Marcasite Group (Orthorhombic: Pnnm) Marcasite FeS2 Pnnm 2/m 2/m 2/m Ferroselite FeSe2 Pnnm 2/m 2/m 2/m Frohbergite FeTe2 Pnnm 2/m 2/m 2/m Hastite? CoSe2 Pnnm 2/m 2/m 2/m Mattagamite CoTe2 Pnnm 2/m 2/m 2/m Kullerudite NiSe2 Pnnm 2/m 2/m 2/m Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m Lollingite FeAs2 Pnnm 2/m 2/m 2/m Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m Nisbite NiSb2 Pnnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.EB.10a 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.10a Frohbergite FeTe2 Pnnm 2/m 2/m 2/m
02.EB.10a Hastite? CoSe2 Pnnm 2/m 2/m 2/m
02.EB.10a Ferroselite FeSe2 Pnnm 2/m 2/m 2/m
02.EB.10a Kullerudite NiSe2 Pnnm 2/m 2/m 2/m
02.EB.10a Mattagamite CoTe2 Pnnm 2/m 2/m 2/m
02.EB.10a Marcasite FeS2 Pnnm 2/m 2/m 2/m

Other Frohbergite 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 Frohbergite :
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.EB.10a





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