Mineralogy Database

Ferroselite Mineral Data

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General Ferroselite Information

Help on Chemical  Formula: Chemical Formula: FeSe2
Help on Composition: Composition: Molecular Weight = 213.77 gm
   Iron      26.13 %  Fe
   Selenium  73.87 %  Se
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Fe2+Se2
Help on Environment: Environment: In red-bed deposits of the Colorado Plateau type, peripheral to pyrite and uranium concentrations.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1955
Help on Locality: Locality: In the USA, at several localities in Utah, on the Colorado Plateau, including the A.E.C. no. 8 mine, Temple Mountain, Emery Co. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the composition.
Help on Name Pronunciation: Name Pronunciation: Ferroselite + Pronunciation Say FERROSELITE
Help on Synonym: Synonym: Hastite
  ICSD 25680
  PDF 21-432
 

Ferroselite Image

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  Ferroselite

Comments: Yellowish silver metallic prismatic ferroselite crystals on matrix.
Location: Virgin No. 3 mine, Paradox Valley, Uravan District, Montrose County, Colorado, USA. Scale: See Image.
© Rruff Database

Ferroselite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.831:1:0.6206
Help on Cell Dimensions: Cell Dimensions: a = 4.8001, b = 5.776, c = 3.585, Z = 2; V = 99.40 Den(Calc)= 7.14
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): 2.59(1), 2.49(0.85), 1.89(0.8),
 

Physical Properties of Ferroselite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Bronze, Steel gray, Silver white.
Help on Density: Density: 7.21
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luster: Luster: Metallic
Help on Streak: Streak: black
 

Optical Properties of Ferroselite

Help on RL Anisotrophism: RL Anisotrophism: Strong, from gray to lilac-gray.
Help on RL Color: RL Color: White with a gray-brown hue.
Help on RL Pleochroism: RL Pleochroism: Distinct.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Ferroselite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   43.80   46.60 
   
 420 nm   43.80   46.80 
 440 nm   43.80   47.00 
 460 nm   43.90   47.60 
 480 nm   44.00   48.30 
 500 nm   44.40   49.20 
 520 nm   44.90   50.40 
 540 nm   45.60   51.40 
 560 nm   46.80   52.50 
 580 nm   47.30   53.80 
 600 nm   48.00   54.90 
 620 nm   48.50   55.80 
 640 nm   48.90   56.60 
 660 nm   49.20   57.30 
 680 nm   49.60   57.70 
 700 nm   49.90   57.80 
Calculated Relative Intensity Colors of Ferroselite in Air
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 200%
R1                  
R2                  
 

Calculated Properties of Ferroselite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.28 gm/cc
note: Specific Gravity of Ferroselite =7.14 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEFerroselite = 67.56 barns/electron
U=PEFerroselite x rElectron Density= 424.21 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ferroselite is Not Radioactive
 

Ferroselite Classification

Help on  Dana Class: Dana Class: 02.12.02.02 (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)
 
02.12.02.01 Marcasite FeS2 Pnnm 2/m 2/m 2/m
 
02.12.02.02 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m
 
02.12.02.03 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m
 
02.12.02.04 Hastite? CoSe2 Pnnm 2/m 2/m 2/m
 
02.12.02.05 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m
 
02.12.02.06 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m
 
02.12.02.07 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m
 
02.12.02.08 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m
 
02.12.02.09 Lollingite FeAs2 Pnnm 2/m 2/m 2/m
 
02.12.02.10 Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m
 
02.12.02.11 Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m
 
02.12.02.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m
 
02.12.02.13 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 Ferroselite 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 Ferroselite :
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
15 - WWW-MINCRYST

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

Ferroselite

FeSe2
Dana No: 02.12.02.02 Strunz No: 02.EB.10a
Locality:

 

Notes:

 

 
   
 


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