Mineralogy Database

Gillulyite Mineral Data

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General Gillulyite Information

Help on Chemical  Formula: Chemical Formula: Tl2(As,Sb)8S13
Help on Composition: 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 % 
Help on Empirical Formula: Empirical Formula: Tl2As6Sb2S13
Help on Environment: Environment: Found in vuggy masses of barite, in barite and calcite veins, and in the silty, carbonaceous limestone host.
Help on IMA Status: IMA Status: Approved IMA 1991
Help on Locality: Locality: Mercury gold deposit, Tooele County, Utah, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in honor of the late James C. Gilluly, United States Geological Survey.
Help on Name Pronunciation: Name Pronunciation: Gillulyite + Pronunciation Say GILLULYITE
Help on Synonym: Synonym: ICSD 80119
  PDF 46-1444

Gillulyite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.6876:1:3.786
Help on Cell Dimensions: Cell Dimensions: a = 9.584, b = 5.679, c = 21.501, Z = 2; beta = 100.07° V = 1,152.22 Den(Calc)= 4.38
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.814(1), 3.077(1), 3.63(0.9),

Physical Properties of Gillulyite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Red, Maroon, Dark red, Blue.
Help on Density: Density: 4.022
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: red

Optical Properties of Gillulyite

Help on Optical Data: Optical Data: Biaxial (?), b=2.81

Calculated Properties of Gillulyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.86 gm/cc
note: Specific Gravity of Gillulyite =4.38 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0020586879
Boson Index = 0.9979413121
Help on Photoelectric: Photoelectric: PEGillulyite = 525.41 barns/electron
U=PEGillulyite x rElectron Density=2,030.55 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gillulyite is Not Radioactive

Gillulyite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.08)where 1 < z/y <2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.08.09)Dana Group Gillulyite Tl2(As,Sb)8S13 P 2/n 2/m
Help on  Strunz Class: Strunz Class: 02.JC.10 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.J - Sulfosalts of PbS Archetype
  02.JC -Galena derivatives, with Tl
02.JC.10 Gillulyite Tl2(As,Sb)8S13 P 2/n 2/m

Other Gillulyite Information

Help on References: References: PHYS. PROP.(Am.Min.,Vol.76,p653-656,1991) OPTIC PROP.(Am.Min.,Vol.76,p653-656,1991)
Help on See Also: See Also: Links to other databases for Gillulyite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 02.JC.10





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