Jankovicite Mineral Data

Jankovicite Mineral Data +

General Jankovicite Information

Chemical Formula:

Tl5Sb9(As,Sb)4S22

Composition:

Molecular Weight = 3,169.63 gm

Thallium 32.24 % Tl

Antimony 38.41 % Sb

Arsenic 7.09 % As

Sulfur 22.26 % S

______

100.00 %

Empirical Formula:

Tl₅Sb₉As₃SbS₂₂

Environment:

In the Sb-poor, As-rich, and Tl-rich zone of the Crven Dol mine.

IMA Status:

Approved IMA 1995

Locality:

Crven Dol mine, Allchar, Macedonia. Link to MinDat.org Location Data.

Name Origin:

For Prof. S. Jankovic (1925- ) in recognition of his work on the mineralogy and geology of Allchar.

Synonym:

ICSD 79846

IMA1993-050

PDF 46-1363

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Jankovicite Crystallography

Axial Ratios:

a:b:c =0.849:1:2.0195

Cell Dimensions:

a = 7.393, b = 8.707, c = 17.584, Z = 1; alpha = 103.133°, beta = 91.132°, gamma = 109.833° V = 1,036.71 Den(Calc)= 5.08

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

Crystal Structure:

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Libowitzky E , Giester G , Tillmanns E , European Journal of Mineralogy , 7 (1995) p.479-487, The crystal structure of jankovicite, Tl5Sb9(As,Sb)4S22

Physical Properties of Jankovicite

Cleavage:

[001] Perfect, [010] Perfect, [100] Perfect

Color:

Black.

Density:

5.08

Diaphaniety:

Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2 - Gypsum

Luminescence:

Non-fluorescent.

Luster:

Metallic

Streak:

violet brown

Optical Properties of Jankovicite

RL Anisotrophism:

Distinct to strong, with gray-blue to green-blue effects.

RL Bireflectance:

Low to medium.

RL Color:

White to bluish white.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Jankovicite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	34.00	36.70
546 nm	32.00	34.90
589 nm	30.50	33.00
650 nm	28.10	29.70

**Calculated Relative Intensity Colors of Jankovicite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	300%
R₁
R₂

Calculated Properties of Jankovicite

Electron Density:

r_electron=4.38 gm/cc
note: r_Jankovicite=5.08 gm/cc.

Fermion Index

Fermion Index = 0.00166
Boson Index = 0.99834

Photoelectric:

PE_Jankovicite= 687.87 barns/electron
U=PE_Jankovicite x r_electron=3,011.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Jankovicite is Not Radioactive

Jankovicite Classification

Dana Class:

3.8.13.2 (3)Sulfides - Sulfosalts

(3.8)where 1 < z/y <2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.8.13)Dana Group

3.8.13.1 Rebulite Tl5Sb5As8S22 P 2₁/c 2/m

3.8.13.2 Jankovicite Tl5Sb9(As,Sb)4S22 P1 1

Strunz Class:

II/E.14-12 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Sulfosalts with predominant Thallium and Mercury, x = 4.0 - 1.6

II/E.14 - Rebulite - Chabourneite series

II/E.14-10 Rebulite Tl5Sb5As8S22 P 2₁/c 2/m

II/E.14-12 Jankovicite Tl5Sb9(As,Sb)4S22 P1 1

II/E.14-15 Imhofite Tl6CuAs16S40 P 2₁/n 2/m

II/E.14-20 Bernardite Tl(As,Sb)5S8 P 2₁/c 2/m

II/E.14-25 Gillulyite Tl2(As,Sb)8S13 P 2/n 2/m

II/E.14-30 Pierrotite Tl2Sb6As4S16 P na2₁ mm2

II/E.14-40 Parapierrotite Tl(Sb,As)5S8 P 2₁/n 2/m

II/E.14-50 Chabourneite (Tl,Pb)21(Sb,As)91S147 P1 1

Other Jankovicite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(MinRec, v 27, p 302)

See Also:

Links to other databases for Jankovicite :
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

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Jankovicite

Tl5Sb9(As,Sb)4S22
Dana No: 3.8.13.2 Strunz No: II/E.14-12
Locality:

Notes: