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Nukundamite Mineral Data
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General Nukundamite Information
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 Chemical Formula: |
(Cu,Fe)4S4 |
| Composition: |
Molecular Weight = 367.05 gm |
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Iron 30.43 % Fe |
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Copper 34.63 % Cu |
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Sulfur 34.94 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Cu2Fe2+2S4 |
| Environment: |
As a primary mineral in a Kuroko-type deposit, also found as an alteration product of chalcopyrite. |
| IMA Status: |
Approved IMA 1979 |
| Locality: |
Undu mine, Nukundamu, Fiji. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Nukundamite + Pronunciation  |
| Synonym: |
ICSD 100727 |
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PDF 16-159 |
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Nukundamite Image |
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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 |
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Nukundamite Crystallography
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| Axial Ratios: |
a:c = 1:2.95795 |
| Cell Dimensions: |
a = 3.782, c = 11.187, Z = 1; V = 138.58 Den(Calc)= 4.40 |
| Crystal System: |
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.143(1), 2.826(0.7), 1.891(0.6), |
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Physical Properties of Nukundamite
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| Cleavage: |
{0001} Perfect |
| Color: |
Copper red. |
| Density: |
4.3 |
| Diaphaneity: |
Opaque |
| Habit: |
Hexagonal - Six-sided crystal shape in cross-section or habit. |
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Hardness: |
3.5 - Copper Penny |
| Luster: |
Metallic |
| Streak: |
dark gray |
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Optical Properties of Nukundamite
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| RL Anisotrophism: |
Very strong, in pale green-gray colors. |
| RL Pleochroism: |
Strong, from reddish orange to pale gray. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Nukundamite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
15.40 |
23.80 |
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| 420 nm |
14.90 |
23.80 |
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| 440 nm |
14.30 |
23.80 |
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| 460 nm |
14.10 |
23.60 |
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| 480 nm |
14.00 |
23.70 |
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| 500 nm |
14.10 |
23.70 |
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| 520 nm |
14.70 |
23.70 |
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| 540 nm |
15.80 |
23.70 |
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| 560 nm |
17.10 |
23.80 |
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| 580 nm |
18.70 |
23.90 |
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| 600 nm |
20.40 |
24.00 |
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| 620 nm |
22.10 |
24.70 |
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| 640 nm |
24.00 |
26.10 |
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| 660 nm |
25.70 |
27.90 |
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| 680 nm |
27.20 |
30.00 |
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| 700 nm |
28.70 |
30.20 |
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Calculated Relative Intensity Colors of Nukundamite in Air
Relative
Intensity |
0% |
70% |
100% |
140% |
210% |
280% |
350% |
420% |
490% |
560% |
610% |
| R1 |
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| R2 |
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Calculated Properties of Nukundamite
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| Electron Density: |
Bulk Density (Electron Density)=4.17 gm/cc
note: Specific Gravity of Nukundamite =4.40 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0090720414
Boson Index = 0.9909279586 |
| Photoelectric: |
PENukundamite = 26.59 barns/electron
U=PENukundamite x rElectron Density= 110.92 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nukundamite is Not Radioactive |
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Nukundamite Classification
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| Dana Class: |
02.09.15.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.09)where Am Bn Xp, with (m+n):p=1:1 |
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(02.09.15)Dana Group |
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02.09.15.01 Nukundamite (Cu,Fe)4S4 P 3m1 3 2/m |
| Strunz Class: |
02.CA.10 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.C - Metal Sulfides, M:S = 1:1 (and similar) |
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02.CA -With Cu |
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02.CA.10 Nukundamite (Cu,Fe)4S4 P 3m1 3 2/m |
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Other Nukundamite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1) |
| 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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