Gillulyite
A valid IMA mineral species
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About Gillulyite
James C. Gilluly
Formula:
Tl2As7.5Sb0.3S13
Colour:
Deep red
Lustre:
Adamantine
Hardness:
2 - 2½
Specific Gravity:
4.02
Crystal System:
Monoclinic
Name:
Named after USGS geologist James C. Gilluly (24 June 1896, Seattle, Washington, USA - 29 December 1980) for his contributions to the understanding of the fundamental geology of the Mercur, Ophir, and Stockton mining districts of Utah. [http://www.nasonline.org/publications/biographical-memoirs/memoir-pdfs/gilluly-james.pdf]
OD structure; several possible polytypes have been proposed (Makovicky & Balić-Žunić, 1999).
Homeotypic with ambrinoite and gerstleyite.
Also compare jankovićite, rebulite, gillulyite, pierrotite; and gungerite.
Gillulyite is very light sensitive and to preserve the true color and luster must be stored in a dark container (http://www.mindat.org/forum.php?file,7,file=58644).
Homeotypic with ambrinoite and gerstleyite.
Also compare jankovićite, rebulite, gillulyite, pierrotite; and gungerite.
Gillulyite is very light sensitive and to preserve the true color and luster must be stored in a dark container (http://www.mindat.org/forum.php?file,7,file=58644).
Unique Identifiers
Mindat ID:
1694
Long-form identifier:
mindat:1:1:1694:6
GUID
(UUID V4):
(UUID V4):
a985586a-c161-4661-b111-a2e62ef35aef
IMA Classification of Gillulyite
Approved
Approval year:
1991
First published:
1991
Classification of Gillulyite
2.JC.10
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
J : Sulfosalts of PbS archetype
C : Galena derivatives, with Tl
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
J : Sulfosalts of PbS archetype
C : Galena derivatives, with Tl
3.8.9.1
3 : SULFOSALTS
8 : 1 < ø < 2
3 : SULFOSALTS
8 : 1 < ø < 2
5.5.12
5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
5 : Sulpharsenites etc. of Tl
5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
5 : Sulpharsenites etc. of Tl
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Gly | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Gillulyite
Adamantine
Transparency:
Translucent
Colour:
Deep red
Comment:
Tarnishes rapidly to a near-metallic luster.
Streak:
Brick red
Hardness:
2 - 2½ on Mohs scale
Cleavage:
Perfect
One perfect cleavage and possbly two poor cleavages (based on pitting during polishing).
One perfect cleavage and possbly two poor cleavages (based on pitting during polishing).
Density:
4.02(2) g/cm3 (Measured) 4.14 g/cm3 (Calculated)
Comment:
Difference may be due to orpiment inclusions.
Optical Data of Gillulyite
Type:
Biaxial
Dispersion:
relatively strong
Reflectivity:
| Wavelength | R1 | R2 | imR1 | imR2 |
|---|---|---|---|---|
| 400nm | 29.8% | 32.0% | 15.0% | 18.6% |
| 420nm | 29.3% | 31.8% | 14.6% | 18.1% |
| 440nm | 28.6% | 31.55% | 13.9% | 17.7% |
| 460nm | 27.8% | 31.0% | 13.2% | 17.05% |
| 470nm | 27.3% | 30.6% | 12.7% | 16.65% |
| 480nm | 27.0% | 30.4% | 12.4% | 16.25% |
| 500nm | 26.1% | 29.6% | 11.6% | 15.5% |
| 520nm | 25.1% | 28.9% | 10.9% | 14.8% |
| 540nm | 24.3% | 28.2% | 10.3% | 14.1% |
| 546nm | 24.1% | 28.0% | 10.1% | 13.9% |
| 560nm | 23.6% | 27.5% | 9.76% | 13.5% |
| 580nm | 23.1% | 26.9% | 9.36% | 12.9% |
| 589nm | 22.8% | 26.6% | 9.19% | 12.6% |
| 600nm | 22.6% | 26.25% | 9.03% | 12.4% |
| 620nm | 22.2% | 25.8% | 8.77% | 12.0% |
| 640nm | 21.9% | 25.4% | 8.59% | 11.8% |
| 650nm | 21.7% | 25.3% | 8.47% | 11.7% |
| 660nm | 21.6% | 25.2% | 8.45% | 11.6% |
| 680nm | 21.35% | 24.9% | 8.27% | 11.4% |
| 700nm | 21.2% | 24.8% | 8.14% | 11.2% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 32.0%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue
Comments:
Reflectivity from Wilson et al. (1993).
Chemistry of Gillulyite
Mindat Formula:
Tl2As7.5Sb0.3S13
Elements listed:
Crystallography of Gillulyite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 9.58 Å, b = 5.67 Å, c = 21.5 Å
β = 100.07°
β = 100.07°
Ratio:
a:b:c = 1.69 : 1 : 3.792
Unit Cell V:
1,149.86 ų (Calculated from Unit Cell)
Morphology:
Simple monoclinic crystals exhibit forms {110}, {010}, and {01l}.
Twinning:
None observed
Comment:
Space group P2/n (Foit et al., 1995). Re-study revealed OD structure (Makovicky & Balić-Žunić, 1999).
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0001733 | Gillulyite | Foit F F, Robinson P D, Wilson J R (1995) The crystal structure of gillulyite, Tl2(As,Sb)8S13, from the Mercur gold deposit, Tooele County, Utah, U.S.A American Mineralogist 80 394-399 |  | 1995 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.14 Å | (60) |
| 3.87 Å | (60) |
| 3.63 Å | (90) |
| 3.077 Å | (100) |
| 2.814 Å | (100) |
| 2.718 Å | (60) |
| 2.613 Å | (55) |
| 2.502 Å | (70) |
| 2.393 Å | (60) |
| 1.766 Å | (70) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 53 : Other minerals with taphonomic origins | <0.4 |
Geological Setting:
In barite veins and in calcite veins.
Type Occurrence of Gillulyite
General Appearance of Type Material:
Cleavable masses up to 2 cm in diameter and, rarely, as crystals to 1 mm in length.
Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Canada.
Harvard University, Cambridge, Massachusetts, USA, 130781.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 170773.
Harvard University, Cambridge, Massachusetts, USA, 130781.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 170773.
Geological Setting of Type Material:
A sediment-hosted, disseminated gold deposit.
Associated Minerals at Type Locality:
Reference:
Wilson, J.R., Robinson, P.D., Wilson, P.N., Stanger, L.W., Salmon, G.L. (1991) Gillulyite, Tl2(As,Sb)8S13, a new thallium arsenic sulfosalt from the Mercur gold deposit, Utah. American Mineralogist, 76, 653-656.
Synonyms of Gillulyite
Other Language Names for Gillulyite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 2.JC.05 | Ellisite | Tl3AsS3 |
| 2.JC.25e | Galenobismutite | PbBi2S4 |
Other Information
Special Storage/
Display Requirements:
Display Requirements:
Protect from light.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Gillulyite
mindat.org URL:
https://www.mindat.org/min-1694.html
Please feel free to link to this page.
Please feel free to link to this page.
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Mineral Dealers:
References for Gillulyite
Reference List:
Wilson, James R., Robinson, Paul D., Wilson, Paula N., Stanger, Larry W., Salmon, Gary L. (1991) Gillulyite, Tl2(As,Sb)8S13, a new thallium arsenic sulfosalt from the Mercur gold deposit, Utah. American Mineralogist, 76 (3-4) 653-656
Wilson, James R., Gupta, Pradip K. Sen, Robinson, Paul D., Criddle, Alan J. (1993) Fangite, Tl3AsS4 a new thallium arsenic sulfosalt from the Mercur Au deposit, Utah, and revised optical data for gillulyite. American Mineralogist, 78 (9-10) 1096-1103
Foit, Franklin F., Robinson, Paul D., Wilson, James R. (1995) The crystal structure of gillulyite, Tl2(As,Sb)8S13, from the Mercur gold deposit, Tooele County, Utah, U.S.A. American Mineralogist, 80 (3) 394-399 doi:10.2138/am-1995-3-421
Localities for Gillulyite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
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Lulu Cut, South Mercur Pit, Mercur Mining District, Tooele County, Utah, USA