Vrbaite Mineral Data

Vrbaite Mineral Data +

General Vrbaite Information

Chemical Formula:

Tl4Hg3Sb2As8S20

Composition:

Molecular Weight = 2,903.50 gm

Thallium 28.16 % Tl

Mercury 20.73 % Hg

Antimony 8.39 % Sb

Arsenic 20.64 % As

Sulfur 22.09 % S

______

100.00 %

Empirical Formula:

Tl₄Hg₃Sb₂As₈S₂₀

Environment:

Intergrown with realgar and orpiment.

IMA Status:

Valid Species (Pre-IMA) 1912

Locality:

Allchar, near Rozsdan, northwest of Salonika, Macedonia, Greece. Link to MinDat.org Location Data.

Name Origin:

Named for Karl Vrba (1845-1922), Czech mineralogist.

Synonym:

ICSD 15240

PDF 20-1264

Vrbaite Image

Images:

Vrbaite Realgar

Comments: Black grain of vrbaite in red realgar matrix.
Location: Allchar, Roszdan, FYR Macedonia. Scale: Picture size 1.7 mm.
© Thomas Witzke / Abraxas-Verlag

Vrbaite Crystallography

Axial Ratios:

a:b:c =0.5676:1:0.483

Cell Dimensions:

a = 13.189, b = 23.235, c = 11.223, Z = 2; V = 3,439.25 Den(Calc)= 2.80

Crystal System:

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

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

By Intensity(I/I_o): 4.04(1), 2.57(0.8), 3.33(0.8),

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Forms: [ 0 1 0] [ 3 3 1] [ 1 1 2] [ 1 1 1] [ 1 0 0]

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Physical Properties of Vrbaite

Cleavage:

[010] Good

Color:

Gray black, Dark red.

Density:

5.3 - 2.3, Average = 3.8

Diaphaniety:

Opaque to subtranslucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Pyramidal - Crystals are shaped like pyramids.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3.5 - Copper Penny

Luster:

Metallic

Streak:

light red

Optical Properties of Vrbaite

Optical Data:

Biaxial (+), b=2.72

RL Color:

Bluish white with red internal reflections, dark red in translucent thin splinters.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Vrbaite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	45.80	48.60
420 nm	42.00	44.60
440 nm	38.20	40.60
460 nm	35.70	38.20
480 nm	33.80	36.70
500 nm	32.20	35.30
520 nm	30.80	34.00
540 nm	29.60	32.50
560 nm	28.60	31.10
580 nm	28.00	30.00
600 nm	27.60	29.20
620 nm	27.30	28.80
640 nm	27.10	28.80
660 nm	26.80	28.60
680 nm	26.60	28.40
700 nm	26.40	28.00

**Calculated Relative Intensity Colors of Vrbaite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	310%
R₁
R₂

Calculated Properties of Vrbaite

Electron Density:

r_electron=2.41 gm/cc
note: r_Vrbaite=2.80 gm/cc.

Fermion Index

Fermion Index = 0.06424
Boson Index = 0.93576

Photoelectric:

PE_Vrbaite= 867.15 barns/electron
U=PE_Vrbaite x r_electron=2,090.60 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Vrbaite is Not Radioactive

Vrbaite Classification

Dana Class:

3.7.15.1 (3)Sulfides - Sulfosalts

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

(3.7.15)Dana Group

3.7.15.1 Vrbaite Tl4Hg3Sb2As8S20 C mca 2/m 2/m 2/m

Strunz Class:

II/E.13-40 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 Vrbaite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Vrbaite :
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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Vrbaite

Tl4Hg3Sb2As8S20
Dana No: 3.7.15.1 Strunz No: II/E.13-40
Locality:

Notes: