Ellisite Mineral Data

Ellisite Mineral Data +

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General Ellisite Information

Chemical Formula:

Tl3AsS3

Composition:

Molecular Weight = 784.27 gm

Thallium 78.18 % Tl

Arsenic 9.55 % As

Sulfur 12.27 % S

______

100.00 %

Empirical Formula:

Tl₃AsS₃

Environment:

In a hydrothermal gold deposit, in mineralized, argillaceous, carbonaceous dolomite beds.

IMA Status:

Approved IMA 1979

Locality:

Carlin gold deposit, Eureka County, Nevada, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Albert J. Ellis (1929-), New Zealand geochemist.

Synonym:

ICSD 100292

PDF 35-723

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Ellisite Crystallography

Axial Ratios:

a:c = 1:0.78278

Cell Dimensions:

a = 12.324, c = 9.647, Z = 7; V = 1,268.90 Den(Calc)= 7.18

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 2.669(1), 3.214(0.53), 5.333(0.37),

Physical Properties of Ellisite

Cleavage:

[1011] Perfect, [1011] Perfect, [1011] Perfect

Color:

Dark gray.

Density:

7.1

Diaphaniety:

Opaque

Fracture:

Hackly - Jagged, torn surfaces, (e.g. fractured metals).

Habit:

Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.

Hardness:

2 - Gypsum

Luster:

Metallic

Streak:

pale brown

Optical Properties of Ellisite

RL Anisotrophism:

Blue-purple to red-purple to brownish orange.

RL Color:

Light gray with a purplish tint with deep red to deep orange-red internal reflections.

RL Pleochroism:

Very weak, in colors from light purplish gray to light pinkish gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Ellisite in Air**
λ	R	∑ R(λ)
470 nm	31.70
546 nm	29.20
589 nm	28.90
650 nm	28.30

**Calculated Relative Intensity Colors of Ellisite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	310%
R

Calculated Properties of Ellisite

Electron Density:

r_electron=5.93 gm/cc
note: r_Ellisite=7.18 gm/cc.

Fermion Index

Fermion Index = 0.00091
Boson Index = 0.99909

Photoelectric:

PE_Ellisite=1,399.96 barns/electron
U=PE_Ellisite x r_electron=8,305.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ellisite is Not Radioactive

Ellisite Classification

Dana Class:

3.4.9.1 (3)Sulfides - Sulfosalts

(3.4)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.4.9)Dana Group

3.4.9.1 Ellisite Tl3AsS3 R 3m 3m

Strunz Class:

II/E.12-40 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.12 - Laffittite - Hatchite series

II/E.12-10 Laffittite AgHgAsS3 Aa m

II/E.12-20 Routhierite TlCu(Hg,Zn)2(As,Sb)2S3 I 4mm 4mm

II/E.12-25 Stalderite TlCu(Zn,Fe,Hg)2As2S6 I 42m 4 2m

II/E.12-30 Christite TlHgAsS3 P 2₁/n 2/m

II/E.12-40 Ellisite Tl3AsS3 R 3m 3m

II/E.12-45 Erniggliite Tl2SnAs2S6 P 3 3

II/E.12-60 Wallisite PbTl(Cu,Ag)As2S5 P1 1

II/E.12-70 Hatchite (Pb,Tl)2AgAs2S5 P1 or P1 1

II/E.12-80 Sicherite! TlAg2(As,Sb)3S6 Pmnb 2/m 2/m 2/m

Other Ellisite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

See Also:

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

Ellisite

Tl3AsS3
Dana No: 3.4.9.1 Strunz No: II/E.12-40
Locality:

Notes: