Mineral Information and Data:

Wermlandite
Mg8Al2(OH)18(SO4)2 • 12H2O [CNMNC approved formula]

Named after the locality: Långban mine, Bergslagen ore district, Filipstad, Värmland (Wermland), Sweden.

IMA status : Approved Species 1971 ()
CLASSIFICATION 
Dana
(8th edition) :
31.03.02.01  
  (31) Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.03) where (A+ B++)5 (XO4) Zq · x(H2O)
  (31.03.02)
  
Nickel-Strunz
(10th edition) :
07.DD.35
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.D) Sulfates (selenates, etc.) with additional anions, with H2O
  (07.DD) With only medium-sized cations; sheets of edge-sharing octahedra
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
  
  
  

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