Mineral Information and Data:

Walthierite
Ba0.5Al3(SO4)2(OH)6 [CNMNC approved formula]

Named for Thomas Nash Walthier (1923-1990), American economic geologist, St. Joseph Minerals Co., who worked in the Tambo district, Chile.

IMA status : Approved Species 1982 ()
CLASSIFICATION 
Dana
(8th edition) :
30.02.04.07  
  (30) Anhydrous Sulfates Containing Hydroxyl or Halogen
  (30.02) where (A B)2 XO4 Zq
  (30.02.04) Alunite Group (Alunite 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 (or 3 2/m) — hexagonal-scalenohedral
  
  
  

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