Mineral Information and Data:

Hydroniumjarosite
(H3O)Fe3+3(SO4)2(OH)6 [CNMNC approved formula]

Named for the composition (hydronium = H + H2O) and jarosite.

IMA status : Approved Species 1960 ()
CLASSIFICATION 
Dana
(8th edition) :
30.02.05.03  
  (30) Anhydrous Sulfates Containing Hydroxyl or Halogen
  (30.02) where (A B)2 XO4 Zq
  (30.02.05) Alunite Group (Jarosite Subgroup)
  
Nickel-Strunz
(10th edition) :
07.BC.10
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.B) Sulfates (selenates, etc.) with Additional Anions, without H2O
  (07.BC) With medium-sized and large cations
  
Crystal system: Trigonal System
Point group (H-M): 3m — ditrigonal-pyramidal
  
  
  

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