Talnakhite Mineral Data

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.

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

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
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
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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

Diaphaniety:

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:

r_electron=4.02 gm/cc
note: r_Talnakhite=4.24 gm/cc.

Fermion Index

Fermion Index = 0.00798
Boson Index = 0.99202

Photoelectric:

PE_Talnakhite= 28.11 barns/electron
U=PE_Talnakhite x r_electron= 113.05 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Talnakhite is Not Radioactive

Talnakhite Classification

Dana Class:

2.9.8.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.9.8)Dana Group

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

2.9.8.2 Haycockite Cu4Fe5S8 P 222 2 2 2

2.9.8.3 Mooihoekite Cu9Fe9S16 P 4₂m- 4 2m

Strunz Class:

II/C.04-40 II - Sulfides and sulphosalts

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

II/C.04 - Chalcopyrite group, Mooihoekite - Orickite series

II/C.04-10 Mooihoekite Cu9Fe9S16 P 4₂m- 4 2m

II/C.04-20 Haycockite Cu4Fe5S8 P 222 2 2 2

II/C.04-30 Putoranite Cu1.1Fe1.2S2 P n3n 4/m 3 2/m

II/C.04-35 Isochalcopyrite* Cu8Fe9S16 Unk Cubic

II/C.04-40 Talnakhite Cu9(Fe,Ni)8S16 I 43m 4 3m

II/C.04-50 Isocubanite CuFe2S3 F m3m 4/m 3 2/m

II/C.04-60 Orickite CuFeS2·(H2O) Unk Hex

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 -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 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Talnakhite Specimen Label here :

Talnakhite

Cu9(Fe,Ni)8S16
Dana No: 2.9.8.1 Strunz No: II/C.04-40
Locality:

Notes: