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Nekrasovite Mineral Data
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General Nekrasovite Information
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 Chemical Formula: |
Cu+26V2(Sn,As,Sb)6S32 |
| Composition: |
Molecular Weight = 3,426.88 gm |
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Vanadium 1.64 % V |
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Zinc 0.19 % Zn |
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Iron 4.73 % Fe |
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Copper 44.50 % Cu |
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Tin 10.39 % Sn |
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Antimony 5.33 % Sb |
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Arsenic 3.28 % As |
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Sulfur 29.94 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Cu18Cu6Fe2+2Zn0.1V3+1.1Fe3+0.9Sn3As1.5Sb1.5S32 |
| Environment: |
In ore aggregates within propylitic andesites and dacites. |
| IMA Status: |
Approved IMA 1984 |
| Locality: |
Khayragatsch deposit, Kuramin Mountains, eastern Uzbekistan. Link to MinDat.org Location Data. |
| Name Origin: |
Named for I. Y. Nekrasov, Russian mineralogist. |
| Name Pronunciation: |
Nekrasovite + Pronunciation  |
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Nekrasovite Crystallography
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| Cell Dimensions: |
a = 10.73, Z = 1; V = 1,235.38 Den(Calc)= 4.61 |
| Crystal System: |
Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: P 43n |
| X Ray Diffraction: |
By Intensity(I/Io): 3.09(1), 1.894(0.8), 1.617(0.6),1.23(0.5), 1.033(0.3), 1.096(0.3), 2.68(0.2), |
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Physical Properties of Nekrasovite
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| Color: |
Reddish brown. |
| Density: |
4.62 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
| Hardness: |
4.5-5 - Near Apatite |
| Luster: |
Metallic |
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Optical Properties of Nekrasovite
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| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Nekrasovite in Air
| λ |
R |
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∑ R(λ) |
| 440 nm |
22.60 |
 |
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| 460 nm |
23.80 |
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| 480 nm |
25.00 |
 |
| 500 nm |
25.60 |
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| 520 nm |
26.00 |
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| 540 nm |
26.40 |
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| 560 nm |
26.90 |
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| 580 nm |
27.40 |
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| 600 nm |
28.00 |
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| 620 nm |
28.60 |
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| 640 nm |
29.30 |
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| 660 nm |
29.60 |
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| 680 nm |
29.90 |
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| 700 nm |
30.00 |
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Calculated Relative Intensity Colors of Nekrasovite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
360% |
370% |
| R |
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Calculated Properties of Nekrasovite
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| Electron Density: |
Bulk Density (Electron Density)=4.27 gm/cc
note: Specific Gravity of Nekrasovite =4.61 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PENekrasovite = 73.85 barns/electron
U=PENekrasovite x rElectron Density= 315.47 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nekrasovite is Not Radioactive |
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Nekrasovite Classification
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| Dana Class: |
03.01.01.03 (03)Sulfides - Sulfosalts |
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(03.01)where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.01.01)Colusite Group (Isometric: P-43n) with Cu and V |
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03.01.01.01 Colusite Cu12-13V(As,Sb,Sn,Ge)3S16 P 43n 4 3m |
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03.01.01.02 Germanocolusite Cu13V(Ge,As)3S16 P 43n 4 3m |
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03.01.01.03 Nekrasovite Cu26V2(Sn,As,Sb)6S32 P 43n 4 3m |
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03.01.01.04 Stibiocolusite Cu13V(Sb,As,Sn)3S16 P 43n 4 3m |
| Strunz Class: |
02.CB.30 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.CB -With Zn, Fe, Cu, Ag, Au, etc |
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02.CB.30 Colusite Cu12-13V(As,Sb,Sn,Ge)3S16 P 43n 4 3m |
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02.CB.30 Germanite Cu26Fe4Ge4S32 P 43n 4 3m |
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02.CB.30 Germanocolusite Cu13V(Ge,As)3S16 P 43n 4 3m |
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02.CB.30 Nekrasovite Cu26V2(Sn,As,Sb)6S32 P 43n 4 3m |
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02.CB.30 Stibiocolusite Cu13V(Sb,As,Sn)3S16 P 43n 4 3m |
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02.CB.30 Maikainite! Cu20(Fe,Cu)6Mo2Ge6S32 P 43n 4 3m |
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02.CB.30 Ovamboite! Cu20(Fe,Cu,Zn)6W2Ge6S32 P 43n 4 3m |
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Other Nekrasovite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Nekrasovite :
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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Nekrasovite
Cu+26V2(Sn,As,Sb)6S32
Dana No: 03.01.01.03 Strunz No: 02.CB.30
Locality:
Notes:
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