Mineral Information and Data:

Butlerite
Fe3+SO4(OH) • 2H2O [CNMNC approved formula]

Named for Gurdon Montague Butler (1881-1961), American mining geologist, University of Arizona, Tucson, Arizona, USA.

IMA status : Valid species (Pre-IMA) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
31.09.01.01  
  (31) Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.09) where (A+ B++) (XO4) Zq · x(H2O)
  (31.09.01)
  
Nickel-Strunz
(10th edition) :
07.DC.10
  (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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