Mineralogy Database

Fettelite Mineral Data

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General Fettelite Information

Help on Chemical  Formula: Chemical Formula: [Ag6As2S7][Ag10HgAs2S8]
Help on Composition: Composition: Molecular Weight = 2,720.84 gm
   Thallium   0.08 %  Tl
   Iron       0.02 %  Fe
   Copper     0.09 %  Cu
   Silver    63.12 %  Ag
   Mercury    7.22 %  Hg
   Antimony   1.57 %  Sb
   Arsenic   10.05 %  As
   Lead       0.15 %  Pb
   Sulfur    17.70 %  S
            100.00 % 
Help on Empirical Formula: Empirical Formula: Ag15.92Cu0.04Pb0.02Fe2+0.01Tl0.01Hg0.98As3.65Sb0.35S15.02
Help on Environment: Environment: Hg-bearing species found in hydrothermal veins cutting basic intrusives of Variscan age.
Help on IMA Status: IMA Status: Approved IMA 1996 (Dana # Added)
Help on Locality: Locality: Nieder-Beerbach, Darmstadt, Odenwald, Germany and Cha´┐Żarcillo, Copiapo Province, Chile (museum specimen). Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for M. Fettel, an experienced mineral collector who found the mineral.
Help on Name Pronunciation: Name Pronunciation: Fettelite + Pronunciation Say FETTELITE
Help on Synonym: Synonym: IMA1994-056

Fettelite Image

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Comments: Deep scarlet red crystals of fettelite.
Location: Glasberg Quarry, Nieder-Beerbach, Odenwald, Hesse, Germany. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Fettelite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7284:1:1.0312
Help on Cell Dimensions: Cell Dimensions: a = 26.0388, b = 15.0651, c = 15.5361, Z = 8; beta = 90.48° V = 6,094.24 Den(Calc)= 5.93
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: C 2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.091(1)(005), 1.878(0.8)(440), 3.175(0.6)(401),2.998(0.4)(402), 2.755(0.3)(043),

Physical Properties of Fettelite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Dark violet, Scarlet red.
Help on Density: Density: 6.29
Help on Diaphaneity: Diaphaneity: Subopaque to Opaque
Help on Fracture: Fracture: Brittle - Irregular - Very brittle fracture producing irregular fragments
Help on Habit: Habit: Flakes - Flat, thin crystals or aggregates.
Help on Habit: Habit: Hexagonal - Six-sided crystal shape in cross-section or habit.
Help on Habit: Habit: Micaceous - Platy texture with "flexible" plates.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luster: Luster: Adamantine - Metallic
Help on Streak: Streak: vermilion

Optical Properties of Fettelite

Help on Optical Data: Optical Data: NCalc= 1.74 - from Gladstone-Dale relationship (KC = 0.1252) where Ncalc=Dcalc*KC+1
NCalc= 1.79 - from Gladstone-Dale relationship (KC = 0.1252) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Weak with strong red internal reflections.
Help on RL Bireflectance: RL Bireflectance: Moderate white to brownish gray.
Help on RL Color: RL Color: Grayish white.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Fettelite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   22.90   30.40 
 550 nm   25.20   28.90 
 580 nm   26.50   26.70 
 650 nm   29.70   23.70 
Calculated Relative Intensity Colors of Fettelite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 360% 390%

Calculated Properties of Fettelite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.27 gm/cc
note: Specific Gravity of Fettelite =5.93 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEFettelite = 294.36 barns/electron
U=PEFettelite x rElectron Density=1,551.43 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fettelite is Not Radioactive

Fettelite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.02)where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.02.06)Dana Group Arcubisite Ag6CuBiS4 Ortho ? Ortho Fettelite! [Ag6As2S7][Ag10HgAs2S8] C 2 2
Help on  Strunz Class: Strunz Class: 02.LA.30 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.L - Unclassified Sulfosalts
  02.LA -Without essential Pb
02.LA.30 Fettelite! [Ag6As2S7][Ag10HgAs2S8] C 2 2

Other Fettelite Information

Help on References: References: NAME( Am.Min.,Vol.82,p621,1997) PHYS. PROP.(AmMin v82:621 and v94:609)
Help on See Also: See Also: Links to other databases for Fettelite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 02.LA.30





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