Nekrasovite Mineral Data

Nekrasovite Mineral Data +

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General Nekrasovite Information

Chemical Formula:

Cu+26V2(Sn,As,Sb)6S32

Composition:

Molecular Weight = 3,426.88 gm

Vanadium 1.64 % V

Zinc 0.19 % Zn

Iron 4.73 % Fe

Copper 44.50 % Cu

Tin 10.39 % Sn

Antimony 5.33 % Sb

Arsenic 3.28 % As

Sulfur 29.94 % S

______

100.00 %

Empirical Formula:

Cu₁₈Cu₆Fe²⁺₂Zn_0.1V³⁺_1.1Fe³⁺_0.9Sn₃As_1.5Sb_1.5S₃₂

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.

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Nekrasovite Crystallography

Cell Dimensions:

a = 10.73, Z = 1; V = 1,235.38 Den(Calc)= 4.61

Crystal System:

Isometric - HextetrahedralH-M Symbol (4 3m) Space Group: P 43n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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),

Physical Properties of Nekrasovite

Color:

Reddish brown.

Density:

4.62

Diaphaniety:

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

Optical Properties of Nekrasovite

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Nekrasovite in Air**
λ	R	∑ R(λ)
440 nm	22.60
460 nm	23.80
480 nm	25.00
500 nm	25.60
520 nm	26.00
540 nm	26.40
560 nm	26.90
580 nm	27.40
600 nm	28.00
620 nm	28.60
640 nm	29.30
660 nm	29.60
680 nm	29.90
700 nm	30.00

**Calculated Relative Intensity Colors of Nekrasovite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	360%	370%
R

Calculated Properties of Nekrasovite

Electron Density:

r_electron=4.27 gm/cc
note: r_Nekrasovite=4.61 gm/cc.

Fermion Index

Fermion Index = 0.02063
Boson Index = 0.97937

Photoelectric:

PE_Nekrasovite= 73.85 barns/electron
U=PE_Nekrasovite x r_electron= 315.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nekrasovite is Not Radioactive

Nekrasovite Classification

Dana Class:

3.1.1.3 (3)Sulfides - Sulfosalts

(3.1)where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.1.1)Colusite Group (Isometric: P4¯3n) with Cu and V

3.1.1.1 Colusite Cu12-13V(As,Sb,Sn,Ge)3S16 P 43n 4 3m

3.1.1.2 Germanocolusite Cu13V(Ge,As)3S16 P 43n 4 3m

3.1.1.3 Nekrasovite Cu26V2(Sn,As,Sb)6S32 P 43n 4 3m

3.1.1.4 Stibiocolusite Cu13V(Sb,As,Sn)3S16 P 43n 4 3m

Strunz Class:

II/C.10-30 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.10 - Stannite group, Germanite series

II/C.10-10 Renierite (Cu,Zn)11(Ge,As)2Fe4S16 P 4₂c- 4 2m

II/C.10-15 Vinciennite Cu10Fe4Sn(As,Sb)S16 P 4₁22 4 2 2

II/C.10-20 Germanite Cu26Fe4Ge4S32 P 43n 4 3m

II/C.10-30 Nekrasovite Cu26V2(Sn,As,Sb)6S32 P 43n 4 3m

II/C.10-40 Colusite Cu12-13V(As,Sb,Sn,Ge)3S16 P 43n 4 3m

II/C.10-45 Stibiocolusite Cu13V(Sb,As,Sn)3S16 P 43n 4 3m

II/C.10-47 Germanocolusite Cu13V(Ge,As)3S16 P 43n 4 3m

II/C.10-50 Arsenosulvanite Cu3(As,V)S4 P 43m 4 3m

II/C.10-50* Maikainite! Cu20(Fe,Cu)6Mo2Ge6S32 P 43n 4 3m

II/C.10-55 Ovamboite! Cu20(Fe,Cu,Zn)6W2Ge6S32 P 43n 4 3m

II/C.10-60 Sulvanite Cu3VS4 P 43m 4 3m

II/C.10-70 Polkovicite (Fe,Pb)3(Ge,Fe)1-xS4 F d3m 4/m 3 2/m

II/C.10-80 Morozeviczite (Pb,Fe)3Ge1-xS4 F d3m 4/m 3 2/m

Other Nekrasovite Information

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Nekrasovite

Cu+26V2(Sn,As,Sb)6S32
Dana No: 3.1.1.3 Strunz No: II/C.10-30
Locality:

Notes: