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About LoránditeHide

Baron Loránd von Eötvös
Cochineal- to carmine-red; often dark lead-gray on the surface and frequently coated by an ochre-yellow powder.
Adamantine, Metallic
2 - 2½
Specific Gravity:
Crystal System:
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.

Classification of LoránditeHide

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

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

7 : ø = 2

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
Transparent, Translucent
Cochineal- to carmine-red; often dark lead-gray on the surface and frequently coated by an ochre-yellow powder.
2 - 2½ on Mohs scale
Very Good
{100} excellent; {201} very good; {001} good.
5.53 g/cm3 (Measured)    5.53 g/cm3 (Calculated)

Optical Data of LoránditeHide

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:
relatively strong
Colour in reflected light:
Bluish gray-white
Internal Reflections:
X nearly perpendicular {100}: ____; Y: purple-red; Z = b: Orange-red.

Chemical Properties of LoránditeHide


Crystallography of LoránditeHide

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

Geological EnvironmentHide

Geological Setting:
Low temperature hydrothermal

Type Occurrence of LoránditeHide

Other Language Names for LoránditeHide

Simplified Chinese:红铊矿

Common AssociatesHide

Associated Minerals Based on Photo Data:
24 photos of Lorándite associated with RealgarAs4S4
21 photos of Lorándite associated with OrpimentAs2S3
16 photos of Lorándite associated with RaguiniteTlFeS2
2 photos of Lorándite associated with FangiteTl3AsS4
1 photo of Lorándite associated with PicotpauliteTlFe2S3
1 photo of Lorándite associated with DorallchariteTlFe3+3(SO4)2(OH)6
1 photo of Lorándite associated with CalciteCaCO3
1 photo of Lorándite associated with StibniteSb2S3

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.40JentschiteTlPbAs2SbS6Mon. 2/m
2.HD.45HutchinsoniteTlPbAs5S9Orth. mmm (2/m 2/m 2/m) : Pbca
2.HD.50BernarditeTlAs5S8Mon. 2/m : P21/b
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. mmm (2/m 2/m 2/m) : Pbca
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
5.5.12GillulyiteTl2As7.5Sb0.3S13Mon. 2/m
5.5.13WeissbergiteTlSbS2Tric. 1 : P1
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
5.5.20ChabournéiteTl4Pb2(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, J.A. (1894): Lorandit, ein neues Thallium-Mineral von Allchar in Macedonien. Mathemat. Természettud. Ertesitö 12, 473.
Krenner (1895) Mat. Termés. Ért.: 13: 258.
Krenner (1897) Zeitschrift für Krystallographie und Mineralogie 27: 98.
Goldschmidt, V. (1899): XVII. Ueber Lorandit von Allchar in Macedonien. Zeitschrift für Krystallographie und Mineralogie 30, 272-294.
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.
Graeser, S. (1967): Ein Vorkommen von Lorandit (TlAsS2) in der Schweiz. Contributions to Mineralogy and Petrology 16, 45-50.
Fleet, M. E. (1973): The crystal structure and bonding of lorandite, Tl2As2S4. Z. Kristallogr. 138, 147-160.
Balić-Žunić, T., Makovicky, E., Moëlo, Y. (1995): Contributions to the crystal chemistry of thallium sulphosalts III. The crystal structure of lorandite (TlAsS2) and its relation to weissbergite (TlSbS2). Neues Jahrbuch für Mineralogie, Abhandlungen 168, 213-235.

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.
  • Anhui
    • Ma'anshan
      • He County
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
    • Qianxinan
      • Xingren County
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.
  • West Azerbaijan Province
    • Takab County
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.
North Macedonia (TL)
  • Kavadarci Municipality
    • Rožden
Math. és Term. tud. Ert. (1894) 12, 473; Goldschmidt, V. (1899): XVII. Ueber Lorandit von Allchar in Macedonien. Zeitschrift für Krystallographie und Mineralogie 30, 272-294.; 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, I., Šorša, A., Tasev, G., Serafimovski, D., & Boev, B. (2017). Mineralogy and geochemistry of trace elements from Crven Dol–Alšar deposit (Republic of Macedonia). Geologica Macedonica, 31(1), 5-20.
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.
Boev, I. and Boev, B. (2016): Lorandite and orpimente [sic] from Edit-25 [sic] north part of Alshar Deposit. Geologica Macedonica, 4 (2), 405-412.
Boev, I. and Boev, B. (2016): Lorandite and orpimente [sic] from Edit-25 [sic] north part of Alshar Deposit. Geologica Macedonica, 4 (2), 405-412.
  • Stavropol Krai
    • Pyatigorsk
      • Lermontovskoe U Deposit
        • Beshtau Mountain
          • mine №1
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
  • Valais
    • Goms
      • Binn
        • Fäld
Graeser, S. (1967): Ein Vorkommen von Lorandit (TlAsS2) in der Schweiz. Contributions to Mineralogy and Petrology 16, 45-50.; Roth, P. (2016): Zwillinge seltener Lengenbach-Mineralien. Schweizer Strahler 50(2), 28-29 (in German and French).
  • Nevada
    • Elko Co.
      • Independence Mountains Mining District
NBMG Spec. Pub. 31 Minerals of Nevada
    • Eureka Co.
      • Lynn Mining District
        • Elko
    • Humboldt Co.
      • Osgood Mountains
        • Potosi Mining District
          • Adam Peak
NBMG Spec. Pub. 31 Minerals of Nevada; Bowell, R.J., Baumann, M., Gingrich, M., Tretbar, D., Perkins, W.F., and Fisher, P.C. (1999) The occurrence of gold at the Getchell mine, Nevada. Journal of Geochemical Exploration: 67: 127-143.; Bowell, R. J., Perkins, W. F., Tahija, D., Ackerman, J., & Mansanti, J. (2005). Application of LAICPMS to trouble shooting mineral processing problems at the Getchell mine, Nevada. Minerals engineering, 18(8), 754-761.
  • Utah
    • Tooele Co.
      • Oquirrh Mountains
        • Mercur Mining District (Camp Floyd Mining District)
Mineral News: 19(12): 1, 3.
          • South Mercur Pit
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.
  • Wyoming
    • Carbon Co.
      • Encampment District
        • Encampment
          • Red Mountain
Rogers, A.F. (1912): Lorandite from the Rambler Mine, Wyoming. American Journal of Science, Fourth Series, 33, No. 194, 105-16.; Dana 7:I:293,439.
Mineral and/or Locality  
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