Mineralogy Database

Furutobeite Mineral Data

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General Furutobeite Information

Help on Chemical  Formula: Chemical Formula: (Cu,Ag)6PbS4
Help on Composition: Composition: Molecular Weight = 761.06 gm
   Copper  41.75 %  Cu
   Silver  14.17 %  Ag
   Lead    27.23 %  Pb
   Sulfur  16.85 %  S
          ______ 
          100.00 % 
Help on Empirical Formula: Empirical Formula: Cu5AgPbS4
Help on Environment: Environment: In veinlets of stromeyerite that cut bornite in the Kuroko zone of a stratbound, Kuroko-type, massive sufide deposit.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Furutobe mine, Akita Prefecture, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Furutobeite + Pronunciation Say FURUTOBEITE
 

Furutobeite Image

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  Furutobeite

Comments: Black, prismatic furutobeite crystals.
Location: Tsumeb, Namibia. Scale: See Image.
© William Pinch

Furutobeite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =5.0529:1:2.4489
Help on Cell Dimensions: Cell Dimensions: a = 20.025, b = 3.963, c = 9.705, Z = 4; beta = 101.57° V = 754.53 Den(Calc)= 6.70
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Cm ?
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.5(1), 2.95(0.9), 2.55(0.7),
 

Physical Properties of Furutobeite

Help on Color: Color: Gray.
Help on Density: Density: 6.74
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Metallic
 

Optical Properties of Furutobeite

Help on RL Anisotrophism: RL Anisotrophism: Moderate, from light yellow to dark brown.
Help on RL Color: RL Color: Creamy yellow tint.
Help on RL Pleochroism: RL Pleochroism: Weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Furutobeite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   35.70   34.20 
   
 420 nm   35.20   34.30 
 440 nm   35.00   34.50 
 460 nm   34.70   34.90 
 480 nm   34.50   35.30 
 500 nm   34.40   35.60 
 520 nm   34.40   35.90 
 540 nm   34.60   36.20 
 560 nm   34.70   36.30 
 580 nm   34.80   36.40 
 600 nm   34.90   36.40 
 620 nm   34.90   36.30 
 640 nm   34.90   36.30 
 660 nm   34.80   36.20 
 680 nm   34.50   36.10 
 700 nm   34.30   36.00 
Calculated Relative Intensity Colors of Furutobeite in Air
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 260%
R1                      
R2                      
 

Calculated Properties of Furutobeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.95 gm/cc
note: Specific Gravity of Furutobeite =6.70 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEFurutobeite = 527.62 barns/electron
U=PEFurutobeite x rElectron Density=3,139.95 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Furutobeite is Not Radioactive
 

Furutobeite Classification

Help on  Dana Class: Dana Class: 02.16.12.01 (02)Sulfides - Including Selenides and Tellurides
  (02.16)with miscellaneous formulae
  (02.16.12)Dana Group
 
02.16.12.01 Furutobeite (Cu,Ag)6PbS4 Cm ? m
 
02.16.12.02 Schlemaite! (Cu,[])6(Pb,Bi)Se4 P 21/m 2/m
Help on  Strunz Class: Strunz Class: 02.BE.10 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)
  02.BE -With Pb(Bi)
 
02.BE.10 Furutobeite (Cu,Ag)6PbS4 Cm ? m
 

Other Furutobeite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Furutobeite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Furutobeite

(Cu,Ag)6PbS4
Dana No: 02.16.12.01 Strunz No: 02.BE.10
Locality:

 

Notes:

 

 
   
 


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