Mineralogy Database

Eclarite Mineral Data

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General Eclarite Information

Help on Chemical  Formula: Chemical Formula: Pb9(Cu,Fe)Bi12S28
Help on Composition: Composition: Molecular Weight = 5,330.11 gm
   Iron      0.52 %  Fe
   Copper    0.60 %  Cu
   Bismuth  47.05 %  Bi
   Lead     34.99 %  Pb
   Sulfur   16.84 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: Pb9Cu0.5Fe2+0.5Bi12S28
Help on Environment: Environment: In gold-bearing sulfide ores of copper located in quartz veins cutting amphibole-grade meta-mafic rocks.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: From Barenbad, west of Hollersbachtal, Salzburg, Austria. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Professor E. Clar of Vienna, Austria.
Help on Name Pronunciation: Name Pronunciation: Eclarite Say ECLARITE
Help on Synonym: Synonym: ICSD 31382
  PDF 35-627

Eclarite Image

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Comments: Black crystalline masses and prismatic crystals of eclarite in fine grained quartz.
Location: Barenbad Mine, Hollersbachtal, Salzburg, Oberosterrich, Austria. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Eclarite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =13.588:1:5.6451
Help on Cell Dimensions: Cell Dimensions: a = 54.76, b = 4.03, c = 22.75, Z = 4; V = 5,020.53 Den(Calc)= 7.05
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.414(1), 2.014(0.8), 2.893(0.7),

Physical Properties of Eclarite

Help on Cleavage: Cleavage: {010} Good, {0kl} Poor
Help on Color: Color: White gray, Tin white.
Help on Density: Density: 6.85
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Fan Shaped - Occurs as radiating crystals shaped like a fan.
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luster: Luster: Metallic
Help on Streak: Streak: lead gray

Optical Properties of Eclarite

Help on RL Anisotrophism: RL Anisotrophism: Distinct in air, strong in oil.
Help on RL Color: RL Color: Whitish gray, bluish gray in oil.
Help on RL Pleochroism: RL Pleochroism: Moderate to distinct.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Eclarite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 480 nm   45.20   51.20 
 546 nm   42.90   47.20 
 589 nm   42.00   46.10 
 644 nm   40.20   45.00 
Calculated Relative Intensity Colors of Eclarite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 210% 220%

Calculated Properties of Eclarite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.84 gm/cc
note: Specific Gravity of Eclarite =7.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEEclarite =1,562.61 barns/electron
U=PEEclarite x rElectron Density=9,133.30 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eclarite is Not Radioactive

Eclarite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.06)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.06.10)Dana Group Eclarite Pb9(Cu,Fe)Bi12S28 P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.HB.10c 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.10c Eclarite Pb9(Cu,Fe)Bi12S28 P nma 2/m 2/m 2/m

Other Eclarite Information

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

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Dana No: Strunz No: 02.HB.10c





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