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Lorándite

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Formula:
TlAsS
 
2
System:MonoclinicColour:Cochineal- to ...
Hardness:2 - 2½
Name:
After Prof. Loránd Eötvös (1848-1919), physicist, mathematician and politician of Budapest.
This page provides mineralogical data about Lorándite.

Classification of Lorándite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/E.13-50
Nickel-Strunz 10th (pending) edition ID:2.HD.05

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
D : With Tl
Dana 8th edition ID:3.7.6.1

3 : SULFOSALTS
7 : ø = 2
Hey's CIM Ref.:5.5.1

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
5 : Sulpharsenites etc. of Tl
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Type Occurrence of Lorándite

Type Locality:Allchar (Alsar; Alshar), Roszdan, Republic of Macedonia
Year of Discovery:1894

Occurrences of Lorándite

Geological Setting:Low temperature hydrothermal

Physical Properties of Lorándite

Lustre:Adamantine, Metallic
Diaphaneity (Transparency):Transparent, Translucent
Colour:Cochineal- to carmine-red; often dark lead-gray on the surface and frequently coated by an ochre-yellow powder.
Streak:Cherry-red
Hardness (Mohs):2 - 2½
Tenacity:Elastic
Cleavage:Very Good
{100} excellent; {201} very good; {001} good.
Density (measured):5.53 g/cm3
Density (calculated):5.53 g/cm3

Crystallography of Lorándite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b
Space Group Setting:P21/a
Cell Parameters:a = 12.28(1) Å, b = 11.30(1) Å, c = 6.101(6) Å
β = 104.6°
Ratio:a:b:c = 1.087 : 1 : 0.54
Unit Cell Volume:V 819.26 ų (Calculated from Unit Cell)
Z:8
Morphology:Short prismatic {110} and striated [001]; also prismatic {201}, {201}; tabular {201}.

Optical Data of Lorándite

Type:Biaxial (+)
RI values: nα = 2.720
Maximum Birefringence:δ = 2.720

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Type:Anisotropic
Anisotropism:Strong
Dispersion:relatively strong
Colour in reflected light:Bluish gray-white
Internal Reflections:Exhibited
Pleochroism:Weak
Comments:X nearly perpendicular {100}: ____; Y: purple-red; Z = b: Orange-red.

Chemical Properties of Lorándite

Formula:
TlAsS
 
2
Simplified for copy/paste:TlAsS2
Essential elements:As, S, Tl
All elements listed in formula:As, S, Tl

Relationship of Lorándite to other Species

Common Associates:
StibniteRealgarPyriteOrpimentMarcasite
GreigiteBaryte
Related Minerals - Nickel-Strunz Grouping):

- +
2.HD.05Weissbergite
TlSbS
 
2
2.HD.15Christite
TlHgAsS
 
3
2.HD.20Jankovićite
Tl
 
5
Sb
 
9
(As,Sb)
 
4
S
 
22
2.HD.25Rebulite
Tl
 
5
Sb
 
5
As
 
8
S
 
22
2.HD.30Imhofite
Tl
 
6
CuAs
 
16
S
 
40
2.HD.35Edenharterite
PbTlAs
 
3
S
 
6
2.HD.40Jentschite
TlPbAs
 
2
SbS
 
6
2.HD.45Hutchinsonite
TlPbAs
 
5
S
 
9
2.HD.50Bernardite
Tl(As,Sb)
 
5
S
 
8
2.HD.55Sicherite
TlAg
 
2
(As,Sb)
 
3
S
 
6
2.HD.60Gabrielite
Tl
 
6
Ag
 
3
Cu
 
6
(As,Sb)
 
9
S
 
21
Related Minerals - Hey's Index Grouping:

- +
5.5.2Ellisite
Tl
 
3
AsS
 
3
5.5.3Imhofite
Tl
 
6
CuAs
 
16
S
 
40
5.5.4Simonite
TlHgAs
 
3
S
 
6
5.5.6Christite
TlHgAsS
 
3
5.5.6Routhierite
Tl(Cu,Ag)(Hg,Zn)
 
2
(As,Sb)
 
2
S
 
6
5.5.7Hutchinsonite
TlPbAs
 
5
S
 
9
5.5.8Wallisite
(Cu,Ag)TlPbAs
 
2
S
 
5
5.5.9Bernardite
Tl(As,Sb)
 
5
S
 
8
5.5.10Vrbaite
Tl
 
4
Hg
 
3
Sb
 
2
As
 
8
S
 
20
5.5.11Rebulite
Tl
 
5
Sb
 
5
As
 
8
S
 
22
5.5.12Gillulyite
Tl
 
2
(As,Sb)
 
8
S
 
13
5.5.13Weissbergite
TlSbS
 
2
5.5.14Rohaite
(Tl,Pb,K)
 
2
Cu
 
8.7
Sb
 
2
S
 
4
5.5.15Vaughanite
TlHgSb
 
4
S
 
7
5.5.16Chalcothallite
Tl
 
2
(Cu,Fe)
 
6
SbS
 
4
5.5.17Pierrotite
Tl
 
2
Sb
 
6
As
 
4
S
 
16
5.5.18Parapierrotite
Tl(Sb,As)
 
5
S
 
8
5.5.19Criddleite
TlAg
 
2
Au
 
3
Sb
 
10
S
 
10
5.5.20Chabournéite
Tl
 
21-x
Pb
 
2x
(Sb,As)
 
91-x
S
 
147
(x = 0-17.5)

Other Names for Lorándite

Other Languages:
German:Lorandit
Russian:Лорандит
Simplified Chinese:红铊矿
Spanish:Lorandita

Other Information

Health Warning:Contains thallium and aresenic - always wash hands after handling. Avoid inhaling dust when handling or breaking. Never lick or ingest.

References for Lorándite

Reference List:

- +
Krenner (1894), Mat. Termés. Ért.: 12: 473.

Krenner (1895), Mat. Termés. Ért.: 13: 258.

Krenner (1897), Zs. Kr.: 27: 98.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 437-439.

Neues Jahrbuch für Mineralogie, Abhandlungen (1995): 168: 213.

Zeitschrift für Kristallographie: 30: 272-294.

Contributions to Mineralogy and Petrology: 16: 45-50.

Acta Crystallographica: 12: 1002-1006.

Internet Links for Lorándite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Lorandite details from Handbook of Mineralogy (PDF)
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  • Localities for Lorándite

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    China
     
    • Anhui Province
      • Ma'anshan Prefecture
        • He Co.
    Zhou, T.F., Fan, Y., Yuan, F., Wu, M.A., Hou, M.J., Voicu, G., Hu, Q.H., Zhang, Q.M., and Yue, S.C. (2005): Mineralogy and Petrology 85(3/4), 243-251
    • Guizhou Province
      • Qianxi'nan Autonomous Prefecture
        • Xingren Co.
    Zhang Baogui, and Zhang Zhong (2001): The biological and reworking metallogenic models of the Lanmuchang Tl deposit. Paper at the 11th Annual V.M. Goldschmidt Conference.
    Zhiwei Bao, Zhenhua Zhao, Guha, J., and Williams-Jones, A.E. (2004): Geochemical Journal 38, 363-381.
    Iran
     
    • West Azarbaijan Province (West Azerbaijan Province)
      • Takab (Takan Tepe)
    Mehrabi, B., Yardley, B.W.D., and Cann, J.R. (1999): Mineralium Deposita 34, 673-696.; Asadi, H.H., Voncken, J.H.L, Kühnel, R.A., and Hale, M. (2000): Mineralium Deposita 35, 656-671.
    Republic of Macedonia
     
    • Roszdan
    Math. és Term.tud.Ert.(1894) 12, 473; The Canadian Mineralogist Vol.32, pp. 649-665 (1994)
    Lechner Alois; Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Volume 271, Issue 2, 15 August 1988, Pages 297-300 ; Naturwissenschaften Volume 75, Number 1, 37-39; American Mineralogist 74:1401; Pavićević, M. K. (1988). Lorandite from Allchar—A low energy solar neutrino dosimeter. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 271(2), 287-296.
    Russia
     
    • Northern Caucasus Region
      • Stavropol'skiy Kray
        • Pyatigorsk
          • Lermontovskoe U Deposit
            • Beshtau Mt.
              • mine №1
    Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Switzerland
     
    • Wallis (Valais)
      • Binn Valley
        • Fäld (Imfeld; Im Feld; Feld)
    Graeser, S. (1967): Contributions to Mineralogy and Petrology 16(1), 45-50.
    USA
     
    • Nevada
      • Elko Co.
        • Independence Mountains District
    NBMG Spec. Pub. 31 Minerals of Nevada
      • Eureka Co.
        • Lynn District
          • Elko
    Min.Rec.:20:469.
      • Humboldt Co.
        • Osgood Mts
          • Potosi District
            • Adam Peak
    NBMG Spec. Pub. 31 Minerals of Nevada
    • Utah
      • Tooele Co.
        • Oquirrh Mts
          • Mercur District (Camp Floyd District)
    Mineral News: 19(12): 1, 3.
            • South Mercur Pit
    American Mineralogist, Volume 76, pages 653-656, 1991
    • Wyoming
      • Albany Co.
        • New Rambler District
    Wyoming State Geological Survey
      • Carbon Co.
        • Encampment District
          • Encampment
            • Red Mountain
    Dana 7:I:293,439.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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