Hessite Mineral Data + Say HESSITE


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General Hessite Information
Help on Chemical Formula: Chemical Formula: Ag2Te
Help on Composition: Composition: Molecular Weight = 235.47 gm
   Silver     45.81 %  Ag
   Tellurium  54.19 %  Te
             ______ 
             100.00 % 
Help on Empirical Formula: Empirical Formula: AgTe
Help on Environment: Environment: Moderate to low temperature veins.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1843
Help on Locality: Locality: Calaveras, Nevada Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Swiss chemist, G. H. Hesse (1802-1850).
Help on Synonym: Synonym: ICSD 73230
  PDF 34-142
  Telluric Silver
 

Hessite Image

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Hessite

Comments: Metallic crystal of hessite on matrix.
Location: Botes, Zlatna, Transylvania, Romania. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals
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Hessite   Choloalite

Comments: Sparse green crusts of choloalite with metallic hessite.
Location: McAlpine Mine, Tuolumne County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species
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Hessite

Comments: Complex latticework of hessite with minor white quartz.
Location: Bot?s Mountains, Bot?s, Transilvania Rumania. Scale: Crystal size: 1 x 0.2 cm.
© Fabre Minerals

Hessite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.8147:1:1.8058
Help on Cell Dimensions: Cell Dimensions: a = 8.13, b = 4.48, c = 8.09, Z = 5; beta = 112.9° V = 271.43 Den(Calc)= 7.20
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.31(1), 2.87(0.8), 2.25(0.7),
Help on Forms: Forms:

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Forms: [ 0 1 1] [ 1 1 1] [ 2 2 3] [ 1 1 1] [ 2 2 3] [ 0 0 1]

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Schneider J , Schulz H , Zeitschrift fur Kristallographie , 203 (1993) p.1-15, X-ray powder diffraction of Ag2Te at temperatures up to 1123 K, Locality: synthetic, Note: T = 297 K

 

Physical Properties of Hessite

Help on Cleavage: Cleavage: [100] Indistinct
Help on Color: Color: Lead gray, Steel gray.
Help on Density: Density: 7.2 - 7.9, Average = 7.55
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: light gray
 

Optical Properties of Hessite

Help on RL Anisotrophism: RL Anisotrophism: Distinct, dark orange to dark blue.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Hessite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   42.10   43.50 
   
 420 nm   41.00   42.60 
 440 nm   39.90   41.70 
 460 nm   39.30   40.80 
 480 nm   38.90   40.30 
 500 nm   38.70   40.20 
 520 nm   38.50   40.50 
 540 nm   38.40   41.10 
 560 nm   38.40   41.60 
 580 nm   38.40   42.00 
 600 nm   38.40   42.40 
 620 nm   38.40   42.70 
 640 nm   38.40   43.00 
 660 nm   38.50   43.10 
 680 nm   38.40   43.20 
 700 nm   38.30   43.20 
Calculated Relative Intensity Colors of Hessite in Air
Relative
Intensity		    0%   30%   60%   90% 100% 120% 150% 180% 210% 230%
R1                    
R2                    
 

Calculated Properties of Hessite

Help on Electron Density: Electron Density:

relectron=6.05 gm/cc
note: rHessite =7.20 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.04329
Boson Index = 0.95671
Help on Photoelectric: Photoelectric:

PEHessite = 321.81 barns/electron
U=PEHessite x relectron=1,948.36 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hessite is Not Radioactive
 

Hessite Classification
Help on Dana Class: Dana Class: 2.4.2.1 (2)Sulfides - Including Selenides and Tellurides
  (2.4)where Am Bn Xp, with (m+n):p=2:1
  (2.4.2)Dana Group
 
2.4.2.1 Hessite Ag2Te P 21/c 2/m
 
2.4.2.2 Cervelleite Ag4TeS Unk Cubic
Help on Strunz Class: Strunz Class: II/B.05-40 II - Sulfides and sulphosalts
  II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides, Selenides and Tellurides with predominant Copper and Silver/Gold
  II/B.05 - Achantite - Empresite series
 
II/B.05-02 Argentite* Ag2S I m3m 4/m 3 2/m
 
II/B.05-10 Acanthite Ag2S P 21/n 2/m
 
II/B.05-30 Naumannite Ag2Se P 212121 2 2 2
 
II/B.05-35 Kurilite* (Ag,Au)2(Te,Se,S) P m3n,P 43n Cubic
 
II/B.05-40 Hessite Ag2Te P 21/c 2/m
 
II/B.05-50 Aguilarite Ag4SeS P 212121 2 2 2
 
II/B.05-60 Cervelleite Ag4TeS Unk Cubic
 
II/B.05-70 Benleonardite Ag8(Sb,As)Te2S3 Tetra Tetra
 
II/B.05-75 Tsnigriite Ag9SbTe3(S,Se)3 P 2/m,Pm Mono
 
II/B.05-80 Stutzite Ag5-xTe3,(x=0.24-0.36) P 6/mmm 6/m 2/m 2/m
 
II/B.05-90 Empressite AgTe Pmnb 2/m 2/m 2/m
 

Other Hessite 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 Hessite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 -Athena 6 - Crocoite.com Mineral Locations 7 - EUROmin Project 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (UofA) 11 - HyperPhysics 12 -MinDAT 13 -MinMax(Deutsch) 14 -MinMax(English) 15 -Mineralienatlas (Deutsch) 16 - Minerals of Wisconsin 17 -QUT Mineral Atlas 18 - WWW-MINCRYST 19 -École des Mines de Paris

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

Hessite

Ag2Te
Dana No: 2.4.2.1 Strunz No: II/B.05-40
Locality:

 

Notes:

 
 
   
 
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