Talnakhite Mineral Data

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General Talnakhite Information

Chemical Formula:

Cu9(Fe,Ni)8S16

Composition:

Molecular Weight = 1,537.43 gm

Iron 21.79 % Fe

Copper 37.20 % Cu

Nickel 7.63 % Ni

Sulfur 33.37 % S

______

100.00 %

Empirical Formula:

Cu₉Fe²⁺₆Ni₂S₁₆

Environment:

In concentrations of up to 70% in hydrothermal vein ores.

IMA Status:

Approved IMA 1968

Locality:

Talnakh area, Taimyr Peninsula, Noril'sk region, Yakutiya, western Siberia, Russia Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Talnakhite + Pronunciation

Synonym:

ICSD 15242

PDF 25-287

Talnakhite Image

Images:

Talnakhite

Comments: Tarnished brown talnakhite with brassy chalcopyrite.
Location: Talnakh Deposit, Norilsk, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Talnakhite Parkerite

Comments: Cut, not polished section showing rounded grains of parkerite (yellow arrow) in 'dactiloscopyc' galena aggregate in talnakhite-chalcopyrite ore. Talnakhite is bronze-violet slightly oxidised grain streaked with golden chalcopyrite.
Location: Taimyr (Oktyabr'skoye; Oktyabr'sky) Cu-Ni deposit, Noril'sk, Putoran Plateau, Taimyr Peninsula, Taymyrskiy Autonomous Okrug, Eastern-Siberian Region, Russia. Scale: Picture Size 4x3 mm.
© Pavel M. Kartashov

Talnakhite Crystallography

Cell Dimensions:

a = 10.64, Z = 2; V = 1,204.55 Den(Calc)= 4.24

Crystal System:

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

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

By Intensity(I/I_o): 3.043(1), 1.879(0.9), 1.598(0.7),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Hall S R , Gabe E J , American Mineralogist , 57 (1972) p.368-380, The crystal structure of talnakhite, Cu18Fe16S32, model B, Note: Cu3-U33 changed to match symmetry constraints

Physical Properties of Talnakhite

Color:

Yellow, Tarnish pink, Tarnish brown.

Density:

4.29

Diaphaneity:

Opaque

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Metallic

Streak:

black

Optical Properties of Talnakhite

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Talnakhite in Air**
λ	R	∑ R(λ)
400 nm	13.00
420 nm	17.10
440 nm	21.20
460 nm	26.20
480 nm	30.60
500 nm	34.10
520 nm	37.00
540 nm	39.40
560 nm	40.80
580 nm	41.70
600 nm	42.30
620 nm	42.80
640 nm	43.00
660 nm	43.20
680 nm	43.30
700 nm	43.40

**Calculated Relative Intensity Colors of Talnakhite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	360%	380%
R

Calculated Properties of Talnakhite

Electron Density:

Bulk Density (Electron Density)=4.02 gm/cc
note: Specific Gravity of Talnakhite =4.24 gm/cc.

Fermion Index:

Fermion Index = 0.0079860783
Boson Index = 0.9920139217

Photoelectric:

PE_Talnakhite= 28.11 barns/electron
U=PE_Talnakhite x rElectron Density= 113.05 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Talnakhite is Not Radioactive

Talnakhite Classification

Dana Class:

02.09.08.01 (02)Sulfides - Including Selenides and Tellurides

(02.09)where Am Bn Xp, with (m+n):p=1:1

(02.09.08)Talnakhite Group

02.09.08.01 Talnakhite Cu9(Fe,Ni)8S16 I 43m 4 3m

02.09.08.02 Haycockite Cu4Fe5S8 P 222 2 2 2

02.09.08.03 Mooihoekite Cu9Fe9S16 P 4₂m- 4 2m

Strunz Class:

02.CB.10b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.C - Metal Sulfides, M:S = 1:1 (and similar)

02.CB -With Zn, Fe, Cu, Ag, Au, etc

02.CB.10b Haycockite Cu4Fe5S8 P 222 2 2 2

02.CB.10b Mooihoekite Cu9Fe9S16 P 4₂m- 4 2m

02.CB.10b Putoranite Cu1.1Fe1.2S2 P n3n 4/m 3 2/m

02.CB.10b Talnakhite Cu9(Fe,Ni)8S16 I 43m 4 3m

Other Talnakhite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Talnakhite :
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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Print or Cut-and-Paste your Talnakhite Specimen Label here :

Talnakhite

Cu9(Fe,Ni)8S16
Dana No: 02.09.08.01 Strunz No: 02.CB.10b
Locality:

Notes: