Tarkianite Mineral Data

General Tarkianite Information

Chemical Formula:

(Cu,Fe)(Re,Mo)4S8

Composition:

Molecular Weight = 952.63 gm

Iron 0.59 % Fe

Copper 5.67 % Cu

Rhenium 54.73 % Re

Molybdenum 12.09 % Mo

Sulfur 26.93 % S

______

100.00 %

Empirical Formula:

Cu_0.85Fe²⁺_0.1Re_2.8Mo_1.2S₈

Environment:

Mineral grain in sulfide concentrate.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Hitura Ni-Cu-PGE mine, Nivala, western central Finland. Link to MinDat.org Location Data.

Name Origin:

Named for Professor Mahmud Tarkian (1941-), of the University of Hamburg, Germany, for his contributions to ore mineralogy.

Synonym:

IMA2003-004

Tarkianite Image

Images:

Tarkianite

Comments: A euhedral grain of tarkianite associated with sperrylite (Sp) in heavy-mineral concentrate. Plane-polarized light, oil immersion, sample 2_72_6.
Location: Sulfide concentrate from Hitura Ni-Cu-PGE mine, Nivala, western central Finland. Scale: See Scale Bar.
© Canadian Mineralogist

Tarkianite Crystallography

Cell Dimensions:

a = 9.563, Z = 4; V = 874.55 Den(Calc)= 7.23

Crystal System:

Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: F43m

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

By Intensity(I/I_o): 5.521(1)(111), 1.841(0.9)(511), 2.389(0.9)(400),2.885(0.9)(311), 1.69(0.8)(440), 2.194(0.7)(331), 1.952(0.6)(422), 2.765(0.3)(222), 4.783(0.2)(200),

Physical Properties of Tarkianite

Cleavage:

None

Color:

Black.

Diaphaneity:

Opaque

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Equant Grains - Granular material with equel dimensions in x, y, and z.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Metallic

Streak:

black

Optical Properties of Tarkianite

RL Anisotrophism:

Absent.

RL Bireflectance:

None.

RL Color:

Light gray in air, slightly brown in oil.

RL Pleochroism:

Absent.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Tarkianite in Air**
λ	R	∑ R(λ)
400 nm	36.55
420 nm	36.82
440 nm	37.13
460 nm	37.80
470 nm	38.02
480 nm	38.24
500 nm	38.41
520 nm	38.61
540 nm	38.72
546 nm	38.87
560 nm	39.03
580 nm	39.13
589 nm	39.18
600 nm	39.24
620 nm	39.20
640 nm	39.21
650 nm	39.30
660 nm	39.30
680 nm	39.42
700 nm	39.49

**Standardized Intensity (100%) Reflection Spectra of Tarkianite in Oil**
λ	R	∑ R(λ)
400 nm	19.65
420 nm	20.12
440 nm	20.19
460 nm	20.80
470 nm	20.91
480 nm	21.02
500 nm	21.39
520 nm	21.65
540 nm	21.72
546 nm	21.76
560 nm	21.81
580 nm	21.88
589 nm	21.84
600 nm	21.80
620 nm	21.95
640 nm	21.98
650 nm	22.12
660 nm	22.26
680 nm	22.39
700 nm	22.36

**Calculated Relative Intensity Colors of Tarkianite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%
R

**Calculated Relative Intensity Colors of Tarkianite in Oil**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	430%
R

Calculated Properties of Tarkianite

Electron Density:

Bulk Density (Electron Density)=6.31 gm/cc
note: Specific Gravity of Tarkianite =7.23 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Tarkianite= 736.38 barns/electron
U=PE_Tarkianite x r_electron=4,645.93 barns/cc.

Radioactivity:

GRapi = 23,197.45 (Gamma Ray American Petroleum Institute Units)
Concentration of Tarkianite per GRapi unit = 43.11 (PPM)

Tarkianite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Tarkianite** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 6.42 cm	558,249	1.51E-05	23,197.45	7.63
100 gm / 2.98 cm	55,825	1.51E-06	2,319.74	0.76
10 gm / 1.38 cm	5,582	1.51E-07	231.97	0.08
1 gm / 6.42 mm	558	1.51E-08	23.20	0.01
0.1 gm / 2.98 mm	56	1.51E-09	2.32	0.00
0.01 gm / 1.38 mm	6	1.51E-10	0.23	0.00
0.001 gm / 0.64 mm	1	1.51E-11	0.02	0.00

Weight of pure Tarkianite in grams (gm) and Calculated Diameter of a Sphere with a Density of 7.23 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem

Tarkianite Classification

Dana Class:

02.10.05.01 (02)Sulfides - Including Selenides and Tellurides

(02.10)where Am Bn Xp, with (m+n):p=3:4

(02.10.05)Dana Group

02.10.05.01 Tarkianite! (Cu,Fe)(Re,Mo)4S8 F43m 4 3m

Strunz Class:

02.DB.30 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.D - Metal Sulfides, M:S = 3:4 and 2:3

02.DB -M:S = 2:3 and similar

02.DB.30 Tarkianite! (Cu,Fe)(Re,Mo)4S8 F43m 4 3m

Other Tarkianite Information

References:

NAME( CanMin, v 42, p 539) PHYS. PROP.(CanMin, v 42, p 539) OPTIC PROP.(CanMin, v 42, p 539)

See Also:

Links to other databases for Tarkianite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Tarkianite

(Cu,Fe)(Re,Mo)4S8
Dana No: 02.10.05.01 Strunz No: 02.DB.30
Locality:

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