Mineral Information and Data:

Sideronatrite
Na2Fe3+(SO4)2(OH) • 3H2O [CNMNC approved formula]

Named after its composition.

IMA status : Valid species (Pre-IMA 1878) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
31.08.03.01  
  (31) Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.08) where (A+ B++)3 (XO4)2 Zq · x(H2O)
  (31.08.03)
  
Nickel-Strunz
(10th edition) :
07.DF.20
  (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: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  
Other Properties: H2O Soluble.

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