Mineralogy Database

Selenium Mineral Data

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General Selenium Information

Help on Chemical  Formula: Chemical Formula: Se
Help on Composition: Composition: Molecular Weight = 78.96 gm
   Selenium 100.00 %  Se
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Se
Help on Environment: Environment: Low temperature due to sublimation of fumarolic vapors. Oxidation-reduction of selenium-bearing solutions in sandstone U and U-V deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1828
Help on Locality: Locality: Grants District, McKinley County, New Mexico, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, Selene, "goddess of the Moon" to contrast Tellure, "earth".
Help on Name Pronunciation: Name Pronunciation: Selenium Say SELENIUM
Help on Synonym: Synonym: ICSD 22251
  PDF 42-1425
  Selen tellurium - Mixture with tellurium
 

Selenium Image

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  Selenium

Comments: Acicular crystals of native Selenium (up to 1 cm in length).
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Specimen size 3 cm.
© Thomas Witzke / Abraxas-Verlag

Selenium Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.13467
Help on Cell Dimensions: Cell Dimensions: a = 4.366, c = 4.954, Z = 3; V = 81.78 Den(Calc)= 4.81
Help on Crystal System: Crystal System: Trigonal - Trapezohedral H-M Symbol (3 2) Space Group: P 3121,P 3221
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3(1), 3.78(0.55), 2.072(0.35),
Help on Forms: Forms:

Mouse
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RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

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Help on Above

Forms: ( 1 1 1) ( 1 1 0)

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Physical Properties of Selenium

Help on Cleavage: Cleavage: {0112} Good
Help on Color: Color: Gray, Purple gray, Reddish.
Help on Density: Density: 4.81
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Disseminated - Occurs in small, distinct particles dispersed in matrix.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: red
 

Optical Properties of Selenium

Help on Dichroism (e): Dichroism (e): cream white.
Help on Dichroism (w): Dichroism (w): brown.
Help on Optical Data: Optical Data: Uniaxial (+), w=3, e=4.04, bire=1.0400.
Help on RL Anisotrophism: RL Anisotrophism: Very strong.
Help on RL Color: RL Color: White in air, darker white to grayish brown in oil, red in transmitted light.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Selenium in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   28.40   38.40 
   
 420 nm   27.40   37.80 
 440 nm   26.40   37.20 
 460 nm   25.50   36.30 
 480 nm   24.80   35.40 
 500 nm   24.30   34.70 
 520 nm   24.00   34.40 
 540 nm   24.10   34.10 
 560 nm   24.40   34.00 
 580 nm   24.80   33.90 
 600 nm   25.40   33.80 
 620 nm   25.80   33.50 
 640 nm   26.00   33.30 
 660 nm   25.80   32.90 
 680 nm   25.20   32.40 
 700 nm   24.60   31.90 
Calculated Relative Intensity Colors of Selenium in Air
Relative
Intensity
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 360%
R1                      
R2                      
 

Calculated Properties of Selenium

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.14 gm/cc
note: Specific Gravity of Selenium =4.81 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PESelenium = 81.52 barns/electron
U=PESelenium x rElectron Density= 337.68 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Selenium is Not Radioactive
 

Selenium Classification

Help on  Dana Class: Dana Class: 01.03.04.01 (01)Native Elements
  (01.03)with semi-metallic and non-metallic elements
  (01.03.04)Dana Group
 
01.03.04.01 Selenium Se P 3121,P 3221 3 2
 
01.03.04.02 Tellurium Te P 3121 3 2
Help on  Strunz Class: Strunz Class: 01.CC.10 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
  01.C - Metalloids and Nonmetals
  01.CC -Sulfur-selenium-iodine
 
01.CC.10 Selenium Se P 3121,P 3221 3 2
 
01.CC.10 Tellurium Te P 3121 3 2
 

Other Selenium 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 Selenium :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Selenium

Se
Dana No: 01.03.04.01 Strunz No: 01.CC.10
Locality:

 

Notes:

 

 
   
 


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