Mineral Information and Data:

Bernardite
TlAs5S8 [CNMNC approved formula]

Named Names in 1989 for Jan Bernard (b.1928), Czech mineralogist.

IMA status : Approved Species 1989 ()
CLASSIFICATION 
Dana
(8th edition) :
03.08.14.02  
  (03) Sulfides - Sulfosalts
  (03.08) where 1 < z/y <2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.08.14)
  
Nickel-Strunz
(10th edition) :
02.HD.50
  (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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