Sicherite Mineral Data

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General Sicherite Information

Chemical Formula:

TlAg2(As,Sb)3S6

Composition:

Molecular Weight = 878.49 gm

Thallium 23.27 % Tl

Silver 24.56 % Ag

Antimony 11.09 % Sb

Arsenic 19.19 % As

Sulfur 21.90 % S

______

100.00 %

Empirical Formula:

TlAg₂As_2.25Sb_0.8S₆

Environment:

Product of late-stage activity of Tl-As-bearing hydrothermal solutions during Alpine metamorphism associated with realgar.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Lengenbach, Binntal, Switzerland. Link to MinDat.org Location Data.

Name Origin:

Named for Valentin Sicher (1925-), member of the Lengenbach syndicates who contributed greatly to the specimen recovery efforts.

Synonym:

IMA1997-051

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Sicherite Crystallography

Axial Ratios:

a:b:c =0.8039:1:0.3684

Cell Dimensions:

a = 12.479, b = 15.522, c = 5.719, Z = 4; V = 1,107.76 Den(Calc)= 5.27

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmnb

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

By Intensity(I/I_o): 2.822(1)(340,331,012), 3.363(0.5)(301), 3.118(0.27)(141),3.21(0.26)(041), 3.29(0.23)(240,311), 2.54(0.17)(341),

Forms:

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Forms: ( 3 0 1) ( 0 0 1) ( 0 3 1) ( 1 4 1) ( 0 1 0)

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Crystal Structure:

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Graeser S , Berlepsch P , Makovicky E , Balic-Zunic T , American Mineralogist , 86 (2001) p.1087-1093, Sicherite, TlAg2(As,Sb)3S6 - a new sulfosalt from Lengenbach (Binntal, Switzerland):, Description and structure determination, Locality: Legenbach quarry, Binnatal, Switzerland

Physical Properties of Sicherite

Cleavage:

None

Color:

Dark gray.

Diaphaneity:

Opaque

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

3 - Calcite

Luster:

Metallic

Streak:

dark brown-red

Optical Properties of Sicherite

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Sicherite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	33.76	36.15
410 nm	33.53	35.82
420 nm	33.33	35.54
430 nm	33.00	35.04
440 nm	32.70	34.63
450 nm	32.31	34.19
460 nm	31.92	33.85
470 nm	31.43	33.43
480 nm	30.99	33.00
490 nm	30.54	32.62
500 nm	30.07	32.25
510 nm	29.59	31.80
520 nm	29.23	31.44
530 nm	28.88	31.08
540 nm	28.52	30.74
550 nm	28.17	30.37
560 nm	27.88	30.05
570 nm	27.61	29.71
580 nm	27.34	29.38
590 nm	27.07	29.08
600 nm	26.79	28.75
610 nm	26.53	28.46
620 nm	26.24	28.15
630 nm	26.02	27.91
640 nm	25.76	27.68
650 nm	25.57	27.44
660 nm	25.33	27.25
670 nm	25.08	26.97
680 nm	24.81	26.70
690 nm	24.90	26.63
700 nm	24.63	26.41

**Standardized Intensity (100%) Reflection Spectra of Sicherite in Oil**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	17.95	21.27
410 nm	17.73	20.93
420 nm	17.67	20.56
430 nm	17.45	20.14
440 nm	17.09	19.63
450 nm	16.77	19.22
460 nm	16.44	18.89
470 nm	15.98	18.41
480 nm	15.65	18.07
490 nm	15.22	17.64
500 nm	14.81	17.26
510 nm	14.49	16.95
520 nm	14.18	16.59
530 nm	13.89	16.29
540 nm	13.62	15.96
550 nm	13.39	15.69
560 nm	13.13	15.37
570 nm	12.94	15.07
580 nm	12.76	14.87
590 nm	12.52	14.53
600 nm	12.30	14.34
610 nm	12.14	14.07
620 nm	11.90	13.84
630 nm	11.73	13.60
640 nm	11.54	13.43
650 nm	11.36	13.17
660 nm	11.16	12.93
670 nm	11.09	12.88
680 nm	11.08	12.73
690 nm	10.96	12.64
700 nm	10.89	12.53

**Calculated Relative Intensity Colors of Sicherite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	330%
R₁
R₂

**Calculated Relative Intensity Colors of Sicherite in Oil**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	700%
R₁
R₂

Calculated Properties of Sicherite

Electron Density:

Bulk Density (Electron Density)=4.63 gm/cc
note: Specific Gravity of Sicherite =5.27 gm/cc.

Fermion Index:

Fermion Index = 0.0016425584
Boson Index = 0.9983574416

Photoelectric:

PE_Sicherite= 505.53 barns/electron
U=PE_Sicherite x rElectron Density=2,341.48 barns/cc.

Radioactivity:

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

Sicherite Classification

Dana Class:

03.07.10.04 (03)Sulfides - Sulfosalts

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

(03.07.10)Simonite Group

03.07.10.01 Simonite TlHgAs3S6 P 2₁/n 2/m

03.07.10.02 Edenharterite TlPbAs3S6 F dd2 mm2

03.07.10.03 Jentschite! TlPbAs2SbS6 P 2₁/n 2/m

03.07.10.04 Sicherite! TlAg2(As,Sb)3S6 Pmnb 2/m 2/m 2/m

Strunz Class:

02.HD.55 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.H - Sulfosalts of SnS Archetype

02.HD -With Tl

02.HD.55 Sicherite! TlAg2(As,Sb)3S6 Pmnb 2/m 2/m 2/m

Other Sicherite Information

References:

NAME( AmMin, Vol 86, p 1087-2001) PHYS. PROP.(AmMin, Vol 86, p 1087-2001)

See Also:

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

Sicherite

TlAg2(As,Sb)3S6
Dana No: 03.07.10.04 Strunz No: 02.HD.55
Locality:

Notes: