Mineral Information and Data:

Fettelite
Ag24HgAs5S20 [CNMNC approved formula]

Named for M. Fettel, an experienced mineral collector who found the mineral.

IMA status : Approved Species 1996 ()
CLASSIFICATION 
Dana
(8th edition) :
03.02.06.02  
  (03) Sulfides - Sulfosalts
  (03.02) where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.02.06)
  
Nickel-Strunz
(10th edition) :
02.LA.30
  (02) Sulfides
  (02.L) Unclassified Sulfosalts
  (02.LA) Without essential Pb
  
Crystal system: Monoclinic System
Point group (H-M): 2 — sphenoidal
  
  
  

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