Mineralogy Database

Hessite Mineral Data

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General Hessite Information

Help on Chemical  Formula: Chemical Formula: Ag2Te
Help on Composition: Composition: Molecular Weight = 343.34 gm
   Silver     62.84 %  Ag
   Tellurium  37.16 %  Te
             ______ 
             100.00 % 
Help on Empirical Formula: Empirical Formula: Ag2Te
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 Name Pronunciation: Name Pronunciation: Hessite Say HESSITE
Help on Synonym: Synonym: ICSD 73230
  Kurilite - hessite or petzite (?)
  PDF 34-142
  Telluric Silver
 

Hessite Image

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  Hessite   Kurilite

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

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  Choloalite   Hessite

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: Botés Mountains, Botés, 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)= 10.50
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-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:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

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I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 1) ( 1 1 1) ( 2 2 3) ( 1 1 1) ( 2 2 3) ( 0 0 1)

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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 Diaphaneity: Diaphaneity: 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: Non-fluorescent.
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: Bulk Density (Electron Density)=8.93 gm/cc
note: Specific Gravity of Hessite =10.5 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEHessite = 302.40 barns/electron
U=PEHessite x rElectron Density=2,700.45 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: 02.04.02.01 (02)Sulfides - Including Selenides and Tellurides
  (02.04)where Am Bn Xp, with (m+n):p=2:1
  (02.04.02)Dana Group
 
02.04.02.01 Hessite Ag2Te P 21/c 2/m
 
02.04.02.02 Cervelleite Ag4TeS Unk Cubic
Help on  Strunz Class: Strunz Class: 02.BA.30c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)
  02.BA -With Cu, Ag, Au
 
02.BA.30c Hessite Ag2Te P 21/c 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 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - HyperPhysics
14 - MinDAT
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info
19 - WWW-MINCRYST

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Ask about Hessite here :
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaol

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

Hessite

Ag2Te
Dana No: 02.04.02.01 Strunz No: 02.BA.30c
Locality:

 

Notes:

 

 
   
 


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