The indexed powder pattern of metasideronatrite, Na4Fe2(SO4)4(OH)2·3H2O, agrees well with the refined unit cell dimensions a = 7.357, b = 16.002, and c = 7.102 Å and space group Pbnm or Pbn21. A comparison of powder data for natural metasideronatrite and that produced from sideronatrite by dehydration over sulphuric acid by Cesbron (1964) shows some differences, possibly due to a difference in water content. Powder data for metasideronatrite and sideronatrite, Na4Fe2(SO4)4(OH)2·6H2O are distinctly different.

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