Mineralogy Database

Lenaite Mineral Data

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General Lenaite Information

Help on Chemical  Formula: Chemical Formula: AgFeS2
Help on Composition: Composition: Molecular Weight = 227.85 gm
   Iron    24.51 %  Fe
   Silver  47.34 %  Ag
   Sulfur  28.15 %  S
          100.00 % 
Help on Empirical Formula: Empirical Formula: AgFe3+S2
Help on Environment: Environment: In goethite pseudomorphs after magnesian siderite.
Help on IMA Status: IMA Status: Approved IMA 1995
Help on Locality: Locality: Silver-lead deposit in the Verkhoyano-Kolymskaya fold system, of the Lena River basin, Eastern Yakutia, Siberia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Lena River.
Help on Name Pronunciation: Name Pronunciation: Lenaite Say LENAITE
Help on Synonym: Synonym: ICSD 56263
  PDF 48-1895

Lenaite Image

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Comments: PPL polished section showing eutectic intergrowth of violet-brown lenaite with bluish-grey stephanite and freibergite (grey with a slight brownish tint).
Location: Privolnoye deposit, Central Yakutia, Russia. Scale: Picture Size 0.14 mm.
© Thomas Witzke

Lenaite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.99516
Help on Cell Dimensions: Cell Dimensions: a = 5.4371, c = 10.8479, Z = 4; V = 320.69 Den(Calc)= 4.72
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Pyramidal H-M Symbol (4mm) Space Group: P 42mc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.15(1), 1.91(0.4), 2.445(0.2),

Physical Properties of Lenaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Gray.
Help on Density: Density: 4.57
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Unknown - Minerals too small to observe fractures.
Help on Habit: Habit: Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 4-4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Metallic
Help on Streak: Streak: dark gray

Optical Properties of Lenaite

Help on RL Anisotrophism: RL Anisotrophism: Moderate in yellowish tints.
Help on RL Bireflectance: RL Bireflectance: None.
Help on RL Color: RL Color: Grayish white.
Help on RL Pleochroism: RL Pleochroism: None.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Lenaite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   30.90   30.60 
 546 nm   32.80   35.80 
 589 nm   31.80   36.50 
 650 nm   28.20   35.00 
Calculated Relative Intensity Colors of Lenaite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 270% 290%

Calculated Properties of Lenaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.35 gm/cc
note: Specific Gravity of Lenaite =4.72 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0073072937
Boson Index = 0.9926927063
Help on Photoelectric: Photoelectric: PELenaite = 126.39 barns/electron
U=PELenaite x rElectron Density= 549.83 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lenaite is Not Radioactive

Lenaite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.09)where Am Bn Xp, with (m+n):p=1:1
  (02.09.01)Chalcopyrite Group (Tetragonal: I-42d) Chalcopyrite CuFeS2 I 42d 4 2m Eskebornite CuFeSe2 I 42d 4 2m Gallite CuGaS2 I 42d 4 2m Roquesite CuInS2 I 42d 4 2m Lenaite AgFeS2 P 42mc 4mm Laforetite! AgInS2 I 42d 4 2m
Help on  Strunz Class: Strunz Class: 02.CB.10a 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.10a Chalcopyrite CuFeS2 I 42d 4 2m
02.CB.10a Eskebornite CuFeSe2 I 42d 4 2m
02.CB.10a Gallite CuGaS2 I 42d 4 2m
02.CB.10a Laforetite! AgInS2 I 42d 4 2m
02.CB.10a Lenaite AgFeS2 P 42mc 4mm
02.CB.10a Roquesite CuInS2 I 42d 4 2m

Other Lenaite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,V81:1283 and v91:1953) OPTIC PROP.(AmMin, 91:1953)
Help on See Also: See Also: Links to other databases for Lenaite :
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.CB.10a





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