Gillulyite Mineral Data

Gillulyite Mineral Data +

General Gillulyite Information

Chemical Formula:

Tl2(As,Sb)8S13

Composition:

Molecular Weight = 1,518.65 gm

Thallium 26.92 % Tl

Antimony 16.03 % Sb

Arsenic 29.60 % As

Sulfur 27.45 % S

______

100.00 %

Empirical Formula:

Tl₂As₆Sb₂S₁₃

Environment:

Found in vuggy masses of barite, in barite and calcite veins, and in the silty, carbonaceous limestone host.

IMA Status:

Approved IMA 1991

Locality:

Mercury gold deposit, Tooele County, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named in honor of the late James C. Gilluly, United States Geological Survey.

Synonym:

ICSD 80119

IMA1989-029

PDF 46-1444

Gillulyite Image

Images:

Gillulyite

Comments: Dark red crystalline gillulyite in white calcite.
Location: South Mercur Pit, Barrick Gold Mine, Mercur, Tooele County, Utah, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gillulyite Crystallography

Axial Ratios:

a:b:c =1.6876:1:3.786

Cell Dimensions:

a = 9.584, b = 5.679, c = 21.501, Z = 2; beta = 100.07° V = 1,152.22 Den(Calc)= 4.38

Crystal System:

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

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

By Intensity(I/I_o): 2.814(1), 3.077(1), 3.63(0.9),

Crystal Structure:

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Foit F F , Robinson P D , Wilson J R , American Mineralogist , 80 (1995) p.394-399, The crystal structure of gillulyite, Tl2(As,Sb)8S13, from the Mercur gold, deposit, Tooele County, Utah, U.S.A

Physical Properties of Gillulyite

Cleavage:

[???] Perfect

Color:

Red, Maroon, Dark red, Blue.

Density:

4.022

Diaphaniety:

Translucent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Sub Metallic

Streak:

red

Optical Properties of Gillulyite

Optical Data:

Biaxial (?), b=2.81

Calculated Properties of Gillulyite

Electron Density:

r_electron=3.86 gm/cc
note: r_Gillulyite=4.38 gm/cc.

Fermion Index

Fermion Index = 0.00205
Boson Index = 0.99795

Photoelectric:

PE_Gillulyite= 525.41 barns/electron
U=PE_Gillulyite x r_electron=2,030.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gillulyite is Not Radioactive

Gillulyite Classification

Dana Class:

3.8.9.1 (3)Sulfides - Sulfosalts

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

(3.8.9)Dana Group

3.8.9.1 Gillulyite Tl2(As,Sb)8S13 P 2/n 2/m

Strunz Class:

II/E.14-25 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 Gillulyite Information

References:

PHYS. PROP.(Am.Min.,Vol.76,p653-656,1991) OPTIC PROP.(Am.Min.,Vol.76,p653-656,1991)

See Also:

Links to other databases for Gillulyite :
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 Gillulyite Specimen Label here :

Gillulyite

Tl2(As,Sb)8S13
Dana No: 3.8.9.1 Strunz No: II/E.14-25
Locality:

Notes: