Mineral Information and Data:

Meta-aluminite
Al2SO4(OH)4 • 5H2O [CNMNC approved formula]

Named as the lower hydrate of aluminite.

IMA status : Approved Species 1968 ()
CLASSIFICATION 
Dana
(8th edition) :
31.07.05.01  
  (31) Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.07) where (A+ B++)2 (XO4) Zq · x(H2O)
  (31.07.05)
  
Nickel-Strunz
(10th edition) :
07.DC.05
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.D) Sulfates (selenates, etc.) with additional anions, with H2O
  (07.DC) With only medium-sized cations; chains of edge-sharing octahedra
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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