Jentschite Mineral Data

Jentschite Mineral Data +

General Jentschite Information

Chemical Formula:

TlPbAs2SbS6

Composition:

Molecular Weight = 875.57 gm

Thallium 23.34 % Tl

Antimony 13.91 % Sb

Arsenic 17.11 % As

Lead 23.66 % Pb

Sulfur 21.97 % S

______

100.00 %

Empirical Formula:

TlPbAs₂SbS₆

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

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

Name Origin:

Named after Franz Jentsch (1868-1908), head of the Binn syndicate that worked the sulfosalt deposit at the Lengenbach quarry.

Synonym:

ICSD 83272

IMA1993-025

Jentschite Image

Images:

Jentschite

Comments: Black and dark red translucent needles of jentschite on white dolomite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Picture width 1 cm.
© Walter Gabriel

Jentschite Crystallography

Axial Ratios:

a:b:c =0.3388:1:0.2439

Cell Dimensions:

a = 8.121, b = 23.969, c = 5.847, Z = 4; beta = 107.68° V = 1,084.37 Den(Calc)= 5.36

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 2.823(1), 3.587(0.86), 2.778(0.84),

Physical Properties of Jentschite

Cleavage:

[101] Perfect

Color:

Black, Dark red.

Density:

5.24

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Sub Metallic

Streak:

dark red

Calculated Properties of Jentschite

Electron Density:

r_electron=4.60 gm/cc
note: r_Jentschite=5.36 gm/cc.

Fermion Index

Fermion Index = 0.05394
Boson Index = 0.94606

Photoelectric:

PE_Jentschite= 884.53 barns/electron
U=PE_Jentschite x r_electron=4,071.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Jentschite is Not Radioactive

Jentschite Classification

Dana Class:

3.7.10.3 (3)Sulfides - Sulfosalts

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

(3.7.10)Dana Group

3.7.10.1 Simonite TlHgAs3S6 P 2₁/n 2/m

3.7.10.2 Edenharterite TlPbAs3S6 F dd2 mm2

3.7.10.3 Jentschite ! TlPbAs2SbS6 P 2₁/n 2/m

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

Strunz Class:

II/E.13-43 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.13 - Livingstonite - Vaughanite series

II/E.13-10 Livingstonite HgSb4S8 A2/a 2/m

II/E.13-20 Grumiplucite! HgBi2S4 C 2/m 2/m

II/E.13-30 Simonite TlHgAs3S6 P 2₁/n 2/m

II/E.13-40 Vrbaite Tl4Hg3Sb2As8S20 C mca 2/m 2/m 2/m

II/E.13-42 Edenharterite TlPbAs3S6 F dd2 mm2

II/E.13-43 Jentschite TlPbAs2SbS6 P 2₁/n 2/m

II/E.13-45 Hutchinsonite (Pb,Tl)2As5S9 P bca 2/m 2/m 2/m

II/E.13-50 Lorandite TlAsS2 P 2₁/a 2/m

II/E.13-60 Weissbergite TlSbS2 P1 1

II/E.13-70 Tvalchrelidzeite Hg12(Sb,As)8S15 P1 1

II/E.13-80 Vaughanite TlHgSb4S7 P1 ? 1

Other Jentschite Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(Min.Mag.,Vol.61,p131-137,1997)

See Also:

Links to other databases for Jentschite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Jentschite

TlPbAs2SbS6
Dana No: 3.7.10.3 Strunz No: II/E.13-43
Locality:

Notes: