Mineralogy Database

Tellurium Mineral Data

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General Tellurium Information

Help on Chemical  Formula: Chemical Formula: Te
Help on Composition: Composition: Molecular Weight = 127.60 gm
   Tellurium 100.00 %  Te
             ______ 
             100.00 % 
Help on Empirical Formula: Empirical Formula: Te
Help on Environment: Environment: Hydrothermal vein mineral.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1783
Help on Locality: Locality: Facebaj, Transylvania, Romania. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the element, Latin, tellus = "earth."
Help on Name Pronunciation: Name Pronunciation: Tellurium + Pronunciation Say TELLURIUM
Help on Synonym: Synonym: ICSD 23058
  PDF 36-1452
  Selen tellurium - Mixture with selenium
 

Tellurium Image

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  Tellurium

Comments: Crystalline native tellurium on quartz.
Location: Rosia Montana (Verespatak), Transylvania, Romania. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Empressite   Tellurium

Comments: Bronze-colored microcrystals of empressite with bright native tellurium crystals.
Location: Rex mine, Boulder County, Colorado, USA. Scale: 1.9 x 1.4 x 0.7 cm.
© Richard Dale / Dale Minerals

Tellurium Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.33011
Help on Cell Dimensions: Cell Dimensions: a = 4.447, c = 5.915, Z = 3; V = 101.30 Den(Calc)= 6.27
Help on Crystal System: Crystal System: Trigonal - Trapezohedral H-M Symbol (3 2) Space Group: P 3121
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.23(1), 2.351(0.37), 2.228(0.31),
Help on Forms: Forms:

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Help on Above

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

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Physical Properties of Tellurium

Help on Cleavage: Cleavage: {100} Good
Help on Color: Color: White, Grayish white.
Help on Density: Density: 6.2
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: grayish white
 

Optical Properties of Tellurium

Help on RL Anisotrophism: RL Anisotrophism: Fairly strong.
Help on RL Color: RL Color: White.
Help on RL Pleochroism: RL Pleochroism: Feeble.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Tellurium in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   58.00   69.80 
   
 420 nm   57.80   69.50 
 440 nm   57.60   69.20 
 460 nm   57.40   69.00 
 480 nm   57.30   68.90 
 500 nm   57.20   68.80 
 520 nm   57.10   68.80 
 540 nm   57.10   68.70 
 560 nm   57.00   68.50 
 580 nm   56.60   68.20 
 600 nm   56.00   67.60 
 620 nm   55.40   67.00 
 640 nm   54.50   66.20 
 660 nm   53.60   65.40 
 680 nm   52.70   64.50 
 700 nm   51.60   63.50 
Calculated Relative Intensity Colors of Tellurium in Air
Relative
Intensity
   0%   20%   40%   60%   80% 100% 120% 140% 160%
R1                  
R2                  
 

Calculated Properties of Tellurium

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.11 gm/cc
note: Specific Gravity of Tellurium =6.27 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PETellurium = 376.32 barns/electron
U=PETellurium x rElectron Density=1,923.10 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tellurium is Not Radioactive
 

Tellurium Classification

Help on  Dana Class: Dana Class: 01.03.04.02 (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 Tellurium Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Tellurium :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineral and Gemstone Kingdom
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Tellurium

Te
Dana No: 01.03.04.02 Strunz No: 01.CC.10
Locality:

 

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