Mineralogy Database

Sternbergite Mineral Data

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General Sternbergite Information

Help on Chemical  Formula: Chemical Formula: AgFe2S3
Help on Composition: Composition: Molecular Weight = 315.76 gm
   Iron    35.37 %  Fe
   Silver  34.16 %  Ag
   Sulfur  30.47 %  S
          ______ 
          100.00 % 
Help on Empirical Formula: Empirical Formula: AgFe2+2S3
Help on Environment: Environment: Secondary silver sulfide in silver-bearing ore deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1828
Help on Locality: Locality: Occurs with pyrargyrite and stephanite at Joachemstal, Bohemia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Count Casper Maria Sternberg (1761-1838), of the National Museum in Prague.
Help on Name Pronunciation: Name Pronunciation: Sternbergite + Pronunciation Say STERNBERGITE
Help on Synonym: Synonym: ICSD 68347
  PDF 38-460
 

Sternbergite Image

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  Sternbergite

Comments: Silvery, blocky to prisimatic sternbergite crystals with minor red pyrargyrite.
Location: Jáchymov (St Joachimsthal), Ostrov, Krusné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic. Scale: Specimen Size 13 x 7 x 3.5 cm.
© Rob Lavinsky

Sternbergite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5731:1:1.1031
Help on Cell Dimensions: Cell Dimensions: a = 6.625, b = 11.558, c = 12.75, Z = 8; V = 976.29 Den(Calc)= 4.30
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.29(1), 2.79(0.7), 3.22(0.5),
Help on Forms: Forms:

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

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

Help on Above

Forms: ( 0 1 1) ( 1 1 1) ( 1 0 2) ( 2 6 3) ( 0 0 1)

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Physical Properties of Sternbergite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Blue violet, Golden brown.
Help on Density: Density: 4.22
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Hardness: Hardness: 1-1.5 - Talc or a little harder
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: black
 

Optical Properties of Sternbergite

Help on RL Anisotrophism: RL Anisotrophism: Strong, bluish and reddish to lilac, reddish brown to light green with purplish pink shades.
Help on RL Color: RL Color: Light brown.
Help on RL Pleochroism: RL Pleochroism: Distinct in browns.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Sternbergite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 420 nm   27.20   31.00 
   
 440 nm   28.40   32.30 
 460 nm   29.40   33.50 
 480 nm   30.40   34.70 
 500 nm   31.10   35.50 
 520 nm   31.60   36.30 
 540 nm   32.30   37.20 
 560 nm   32.90   37.60 
 580 nm   33.40   37.90 
 600 nm   34.00   38.10 
 620 nm   34.50   38.30 
 640 nm   34.90   38.40 
 660 nm   35.10   38.50 
 680 nm   35.20   38.40 
 700 nm   35.20   38.30 
Calculated Relative Intensity Colors of Sternbergite in Air
Relative
Intensity
   0%   40%   80% 100% 120% 160% 200% 240% 280% 310%
R1                    
R2                    
 

Calculated Properties of Sternbergite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.00 gm/cc
note: Specific Gravity of Sternbergite =4.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.009784
Boson Index = 0.990216
Help on Photoelectric: Photoelectric: PESternbergite = 96.36 barns/electron
U=PESternbergite x rElectron Density= 385.78 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sternbergite is Not Radioactive
 

Sternbergite Classification

Help on  Dana Class: Dana Class: 02.09.12.01 (02)Sulfides - Including Selenides and Tellurides
  (02.09)where Am Bn Xp, with (m+n):p=1:1
  (02.09.12)Dana Group
 
02.09.12.01 Sternbergite AgFe2S3 C mma 2/m 2/m 2/m
 
02.09.12.02 Picotpaulite TlFe2S3 C 222 2 2 2
Help on  Strunz Class: Strunz Class: 02.CB.65 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.C - Metal Sulfides, M:S = 1:1 (and similar)
  02.CB -With Zn, Fe, Cu, Ag, Au, etc
 
02.CB.65 Argentopyrite AgFe2S3 Pmmn 2/m 2/m 2/m
 
02.CB.65 Sternbergite AgFe2S3 C mma 2/m 2/m 2/m
 

Other Sternbergite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Sternbergite :
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 Sternbergite Specimen Label here :

Sternbergite

AgFe2S3
Dana No: 02.09.12.01 Strunz No: 02.CB.65
Locality:

 

Notes:

 

 
   
 


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