Mineralogy Database

Nukundamite Mineral Data

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General Nukundamite Information

Help on Chemical  Formula: Chemical Formula: (Cu,Fe)4S4
Help on Composition: Composition: Molecular Weight = 367.05 gm
   Iron    30.43 %  Fe
   Copper  34.63 %  Cu
   Sulfur  34.94 %  S
          ______ 
          100.00 % 
Help on Empirical Formula: Empirical Formula: Cu2Fe2+2S4
Help on Environment: Environment: As a primary mineral in a Kuroko-type deposit, also found as an alteration product of chalcopyrite.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Undu mine, Nukundamu, Fiji. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Nukundamite + Pronunciation Say NUKUNDAMITE
Help on Synonym: Synonym: ICSD 100727
  PDF 16-159
 

Nukundamite Image

Click Here for Larger   Image in a New Browser Window Images:
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  Nukundamite   Covellite

Comments: Metallic brownish rim of nukundamite with dark purplish-blue covellite on fine-grained pyrite.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Nukundamite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.95795
Help on Cell Dimensions: Cell Dimensions: a = 3.782, c = 11.187, Z = 1; V = 138.58 Den(Calc)= 4.40
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.143(1), 2.826(0.7), 1.891(0.6),
 

Physical Properties of Nukundamite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Copper red.
Help on Density: Density: 4.3
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Hexagonal - Six-sided crystal shape in cross-section or habit.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Metallic
Help on Streak: Streak: dark gray
 

Optical Properties of Nukundamite

Help on RL Anisotrophism: RL Anisotrophism: Very strong, in pale green-gray colors.
Help on RL Pleochroism: RL Pleochroism: Strong, from reddish orange to pale gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Nukundamite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   15.40   23.80 
   
 420 nm   14.90   23.80 
 440 nm   14.30   23.80 
 460 nm   14.10   23.60 
 480 nm   14.00   23.70 
 500 nm   14.10   23.70 
 520 nm   14.70   23.70 
 540 nm   15.80   23.70 
 560 nm   17.10   23.80 
 580 nm   18.70   23.90 
 600 nm   20.40   24.00 
 620 nm   22.10   24.70 
 640 nm   24.00   26.10 
 660 nm   25.70   27.90 
 680 nm   27.20   30.00 
 700 nm   28.70   30.20 
Calculated Relative Intensity Colors of Nukundamite in Air
Relative
Intensity
   0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 610%
R1                      
R2                      
 

Calculated Properties of Nukundamite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.17 gm/cc
note: Specific Gravity of Nukundamite =4.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0090720414
Boson Index = 0.9909279586
Help on Photoelectric: Photoelectric: PENukundamite = 26.59 barns/electron
U=PENukundamite x rElectron Density= 110.92 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nukundamite is Not Radioactive
 

Nukundamite Classification

Help on  Dana Class: Dana Class: 02.09.15.01 (02)Sulfides - Including Selenides and Tellurides
  (02.09)where Am Bn Xp, with (m+n):p=1:1
  (02.09.15)Dana Group
 
02.09.15.01 Nukundamite (Cu,Fe)4S4 P 3m1 3 2/m
Help on  Strunz Class: Strunz Class: 02.CA.10 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.C - Metal Sulfides, M:S = 1:1 (and similar)
  02.CA -With Cu
 
02.CA.10 Nukundamite (Cu,Fe)4S4 P 3m1 3 2/m
 

Other Nukundamite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Nukundamite :
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
15 - WWW-MINCRYST

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Nukundamite

(Cu,Fe)4S4
Dana No: 02.09.15.01 Strunz No: 02.CA.10
Locality:

 

Notes:

 

 
   
 


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