Mineral Information and Data:

Clairite
(NH4)2Fe3+3(SO4)4(OH)3 • 3H2O [CNMNC approved formula]

Named for Claire Martini (1936-), South African, wife of the describer of the species, Jacques Edouard Martini.

IMA status : Approved Species 1983 ()
CLASSIFICATION 
Dana
(8th edition) :
31.10.08.01  
  (31) Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.10) miscellaneous
  (31.10.08)
  
Nickel-Strunz
(10th edition) :
07.DF.55
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.D) Sulfates (selenates, etc.) with additional anions, with H2O
  (07.DF) With large and medium-sized cations
  
Crystal system:  
Point group (H-M):
  
  
  
Other Properties: H2O Soluble.

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