Nagyagite Mineral Data

Nagyagite Mineral Data
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General Nagyagite Information

Help on Chemical Formula: Chemical Formula: AuPb(Sb,Bi)Te2-3S6
Help on Composition: Composition: Molecular Weight = 1,059.12 gm
   Bismuth     4.93 %  Bi
   Antimony    8.62 %  Sb
   Tellurium  30.12 %  Te
   Lead       19.56 %  Pb
   Gold       18.60 %  Au
   Sulfur     18.17 %  S
             ______ 
             100.00 % 
Help on Empirical Formula: Empirical Formula: AuPbSb0.75Bi0.25Te2.5S6
Help on Environment: Environment: Epithermal hydrothermal veins.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1845
Help on Locality: Locality: Nagyag mine (now Sacaramb), Romania. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality.
Help on Name Pronunciation: Name Pronunciation: Nagyagite + Pronunciation Say NAGYAGITE
Help on Synonym: Synonym: ICSD 87711
  PDF 47-1755
 

Nagyagite Image

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Nagyagite

Comments: Nagyagite partially covered with calcite.
Location: Sacaramb (Nagyag), Romania. Scale: Crystal size 1 cm.
© John Veevaert

Nagyagite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:7.2826
Help on Cell Dimensions: Cell Dimensions: a = 4.14, c = 30.15, Z = 2; V = 516.76 Den(Calc)= 6.81
Help on Crystal System: Crystal System: Tetragonal - DisphenoidalH-M Symbol (4) Space Group: P 4
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.02(1), 1.506(0.6), 2.81(0.6),
Click Here for Large Nagyagite Structure Window Crystal Structure:

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Effenberger H , Paar W H , Topa D , Culetto F J , Giester G , American Mineralogist , 84 (1999) p.669-676, Toward the crystal structure of nagyagite, [Pb(Pb,Sb)S2][(Au,Te)]

 

Physical Properties of Nagyagite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Lead gray, Black.
Help on Density: Density: 7.5
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Hackly - Jagged, torn surfaces, (e.g. fractured metals).
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
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: gray black
 

Optical Properties of Nagyagite

Help on RL Anisotrophism: RL Anisotrophism: Weak but distinct.
Help on RL Color: RL Color: Gray-white.
Help on RL Pleochroism: RL Pleochroism: Weak in air and oil.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Nagyagite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   43.20   49.00 
   
 420 nm   42.80   48.00 
 440 nm   42.20   47.00 
 460 nm   41.60   45.90 
 480 nm   40.90   45.00 
 500 nm   40.30   44.20 
 520 nm   39.60   43.50 
 540 nm   38.80   42.80 
 560 nm   38.10   42.10 
 580 nm   37.50   41.50 
 600 nm   37.00   40.90 
 620 nm   36.50   40.30 
 640 nm   36.10   39.80 
 660 nm   35.50   39.20 
 680 nm   34.80   38.60 
 700 nm   34.20   38.00 
Calculated Relative Intensity Colors of Nagyagite in Air
Relative
Intensity		    0%   30%   60%   90% 100% 120% 150% 180% 210% 240%
R1                    
R2                    
 

Calculated Properties of Nagyagite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.74 gm/cc
note: Specific Gravity of Nagyagite =6.81 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PENagyagite = 892.17 barns/electron
U=PENagyagite x rElectron Density=5,116.97 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nagyagite is Not Radioactive
 

Nagyagite Classification
Help on Dana Class: Dana Class: 02.11.10.01 (02)Sulfides - Including Selenides and Tellurides
  (02.11)where Am Bn Xp, with (m+n):p=2:3
  (02.11.10)Dana Group
 
02.11.10.01 Nagyagite AuPb(Sb,Bi)Te2-3S6 P 4 4
Help on Strunz Class: Strunz Class: 02.HB.20a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.H - Sulfosalts of SnS Archetype
  02.HB -With Cu, Ag, Hg, Fe, Sn and Pb
 
02.HB.20a Nagyagite AuPb(Sb,Bi)Te2-3S6 P 4 4
 

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

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Nagyagite

AuPb(Sb,Bi)Te2-3S6
Dana No: 02.11.10.01 Strunz No: 02.HB.20a
Locality:

 

Notes: