Mineral Information and Data:

Lorandite
TlAsS2 [CNMNC approved formula]

Named for Eotovos Laorand (1848-1919), physicist of Budapest, Hungary.

IMA status : Valid species (Pre-IMA 1894) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
03.07.06.01  
  (03) Sulfides - Sulfosalts
  (03.07) where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.07.06)
  
Nickel-Strunz
(10th edition) :
02.HD.05
  (02) Sulfides
  (02.H) Sulfosalts of SnS Archetype
  (02.HD) With Tl
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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