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Lorándite

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Baron Loránd von Eötvös
Formula:
TlAsS2
Colour:
Cochineal- to carmine-red; often dark lead-gray on the surface and frequently coated by an ochre-yellow powder.
Lustre:
Adamantine, Metallic
Hardness:
2 - 2½
Specific Gravity:
5.53
Crystal System:
Monoclinic
Name:
After Prof. Loránd Eötvös (1848-1919), physicist, mathematician and politician of Budapest.
Chemically, the As analogue of (triclinic) weissbergite.

Some unique occurrences (China) are mined as thallium ore.


Hide all sections | Show all sections

Classification of LoránditeHide

Approved, 'Grandfathered' (first described prior to 1959)
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
3.7.6.1

3 : SULFOSALTS
7 : ø = 2
5.5.1

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

Physical Properties of LoránditeHide

Adamantine, Metallic
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:
2 - 2½ on Mohs scale
Tenacity:
Elastic
Cleavage:
Very Good
{100} excellent; {201} very good; {001} good.
Density:
5.53 g/cm3 (Measured)    5.53 g/cm3 (Calculated)

Optical Data of LoránditeHide

Type:
Biaxial (+)
RI values:
nα = 2.720
Max Birefringence:
δ = 2.720
Image 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 LoránditeHide

Formula:
TlAsS2

Crystallography of LoránditeHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
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 V:
819.26 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Short prismatic {110} and striated [001]; also prismatic {201}, {201}; tabular {201}.

Type Occurrence of LoránditeHide

Other Language Names for LoránditeHide

German:Lorandit
Simplified Chinese:红铊矿
Spanish:Lorandita

Common AssociatesHide

BaryteBaSO4
GreigiteFe2+Fe3+2S4
MarcasiteFeS2
OrpimentAs2S3
PyriteFeS2
RealgarAs4S4
StibniteSb2S3
Associated Minerals Based on Photo Data:
Realgar24 photos of Lorándite associated with Realgar on mindat.org.
Orpiment21 photos of Lorándite associated with Orpiment on mindat.org.
Raguinite16 photos of Lorándite associated with Raguinite on mindat.org.
Fangite2 photos of Lorándite associated with Fangite on mindat.org.
Picotpaulite1 photo of Lorándite associated with Picotpaulite on mindat.org.
Dorallcharite1 photo of Lorándite associated with Dorallcharite on mindat.org.
Calcite1 photo of Lorándite associated with Calcite on mindat.org.
Stibnite1 photo of Lorándite associated with Stibnite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.HD.05WeissbergiteTlSbS2Tric. 1 : P1
2.HD.15ChristiteTlHgAsS3Mon. 2/m
2.HD.20JankovićiteTl5Sb9(As,Sb)4S22Tric. 1 : P1
2.HD.25RebuliteTl5Sb5As8S22Mon. 2/m : P21/b
2.HD.30ImhofiteTl5.8As15.4S26Mon. 2/m
2.HD.35EdenharteritePbTlAs3S6Orth.
2.HD.40JentschiteTlPbAs2SbS6Mon.
2.HD.45HutchinsoniteTlPbAs5S9Orth.
2.HD.50BernarditeTlAs5S8Mon. 2/m : P21/b
2.HD.55SicheriteTlAg2(As,Sb)3S6Orth.
2.HD.60GabrieliteTl6Ag3Cu6(As,Sb)9S21Tric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

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
5.5.12GillulyiteTl2(As,Sb)8S13Mon.
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

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

References for LoránditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Zemann, A., Zemann, J. (1959): Zur Kenntnis der Kristallstruktur von Lorandit, TlAsS2. Acta Crystallographica 12, 1002-1006.
Fleet, M. E. (1973): The crystal structure and bonding of lorandite, Tl2As2S4. Z. Kristallogr. 138, 147-160.
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 LoránditeHide

Localities for LoránditeHide

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.
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; Fan, Y., Zhou, T., Yuan, F., & Wu, M. (2014). Geological and geochemical constraints on the genesis of the Xiangquan Tl-only deposit, eastern China. Ore Geology Reviews, 59, 97-108.
  • 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 (TL)
 
  • Kavadarci
    • Rožden (Rozhden; Roszdan)
Math. és Term.tud.Ert.(1894) 12, 473; Percival, T.J. & Radtke, A.S. (1994): Sedimentary-rock-hosted disseminated gold mineralization in the Alšar district, Macedonia. Canadian Mineralogist, 32, 649-655.; Boevl, B., Bermanec, V., Serafimovski, T., Lepitkoval, S., & Mikulcic, S. (2001). Allchar Mineral Assemblage. Geologica Macedonica, Vol. 15-16, p. 1-23 (2001-2002) Suppl
Boev, Ivan and Boev, Blazo (2016) Lorandite and Orpimente From Edit-25 North Part of Alshar Deposit. Geologica Macedonica, 4 (2). pp. 405-412. ISSN 0352-1206
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; Roth, P. (2016): Zwillinge seltener Lengenbach-Mineralien. Schweizer Strahler 50(2), 28-29 (in German and French).
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.
Mineral and/or Locality  
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