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Lorándite

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Allchar (Alsar), Roszdan, Republic of Macedonia
© Thomas Witzke

Show Lorándite Photos (21)
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), 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 {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
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
Essential elements:As, S, Tl
All elements listed in formula:As, S, Tl

Relationship of Lorándite to other Species

Common Associates:
StibniteRealgarOrpimentGreigiteMarcasite
PyriteBaryte
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.20Jankovicite
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
(Tl,Pb)
 
2
As
 
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
(Tl,Pb)
 
2
As
 
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
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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    Localities for Lorándite

    Hide Locality List
    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
      • Chaohu 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
      • 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
    Russia
     
    • Northern Caucasus Region
      • Stavropol'skiy Kray
        • Pyatigorsk
          • Beshtau U Deposit
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Switzerland
     
    • Wallis (Valais)
      • Binn Valley
        • Im Feld (Imfeld; Feld; Fäld)
    		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.
        • 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.
    Mineral and/or Locality
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