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Gillulyite

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About GillulyiteHide

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 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]
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).

An unnamed Sb-analogue is currently under study (Topa et al., unpublished data 2018).


Classification of GillulyiteHide

Approved
Approval Year:
1991
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
3.8.9.1

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

Physical Properties of GillulyiteHide

Adamantine
Transparency:
Translucent
Colour:
Deep red
Comment:
Tarnishes rapidly to a near-metallic luster.
Streak:
Brick red
Hardness:
2 - 2½ on Mohs scale
Density:
4.02(2) g/cm3 (Measured)    4.14 g/cm3 (Calculated)
Comment:
Difference may be due to orpiment inclusions.

Optical Data of GillulyiteHide

Type:
Biaxial
Dispersion:
relatively strong

Chemical Properties of GillulyiteHide

Formula:
Tl2As7.5Sb0.3S13

Crystallography of GillulyiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 9.58 Å, b = 5.67 Å, c = 21.5 Å
β = 100.07°
Ratio:
a:b:c = 1.69 : 1 : 3.792
Unit Cell V:
1,149.86 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.14(60)
3.87(60)
3.63(90)
3.077(100)
2.814(100)
2.718(60)
2.613(55)
2.502(70)
2.393(60)
1.766(70)

Type Occurrence of GillulyiteHide

Synonyms of GillulyiteHide

Other Language Names for GillulyiteHide

German:Gillulyit
Simplified Chinese:辉砷锑铊矿
Spanish:Gillulyita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Baryte4 photos of Gillulyite associated with Baryte on mindat.org.
Orpiment3 photos of Gillulyite associated with Orpiment on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.JC.05EllisiteTl3AsS3Trig. 3m : R3m
2.JC.25eGalenobismutitePbBi2S4Orth. mmm (2/m 2/m 2/m)
2.JC.40aNakaseiteCuAg3Pb4Sb12S24

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

5.5.1LoránditeTlAsS2Mon. 2/m : P21/b
5.5.2EllisiteTl3AsS3Trig. 3m : R3m
5.5.3ImhofiteTl5.8As15.4S26Mon. 2/m
5.5.4SimoniteTlHgAs3S6Mon. 2/m
5.5.6ChristiteTlHgAsS3Mon. 2/m
5.5.6RouthieriteTl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6Tet. 4 2m : I4 2m
5.5.7HutchinsoniteTlPbAs5S9Orth.
5.5.8Wallisite(Cu,Ag)TlPbAs2S5Tric.
5.5.9BernarditeTlAs5S8Mon. 2/m : P21/b
5.5.10VrbaiteHg3Tl4As8Sb2S20Orth. mmm (2/m 2/m 2/m) : Cmca
5.5.11RebuliteTl5Sb5As8S22Mon. 2/m : P21/b
5.5.13WeissbergiteTlSbS2Tric. 1 : P1
5.5.14Rohaite(Tl,Pb,K)2Cu8.7Sb2S4Orth.
5.5.15VaughaniteTlHgSb4S7Tric.
5.5.16ChalcothalliteTl2(Cu,Fe)6SbS4Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
5.5.17PierrotiteTl2(Sb,As)10S16Orth. mm2 : Pna21
5.5.18ParapierrotiteTlSb5S8Mon. m
5.5.19CriddleiteTlAg2Au3Sb10S10Mon.
5.5.20ChabournéiteTl4Pb2(Sb,As)20S34Tric. 1 : P1

Other InformationHide

Special Storage/
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.

References for GillulyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 [http://www.minsocam.org/ammin/AM76/AM76_653.pdf]
American Mineralogist: 78: 1096-1103.
Foit, F.F. Jr., Robinson, P.D., and 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.
Makovicky, E., Balić-Žunić, T. (1999): Gillulyite Tl2(As,Sb)8S13: Reinterpretation of the crystal structure and order-disorder phenomena. American Mineralogist, 84, 400-406.

Internet Links for GillulyiteHide

Localities for GillulyiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • Utah
    • Tooele Co.
      • Oquirrh Mts
        • Mercur District (Camp Floyd District)
          • South Mercur Pit
American Mineralogist, Volume 76, pages 653-656, 1991
Mineral and/or Locality  
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