AM_Natrojarosite_4 Formula: Na.67 H6.33 Fe3 S2 O14 Name: Natrojarosite Unit cell: 7.3254 7.3254 16.7209 90.0 90.0 120.0 , V=777.06 Space group: R-3M (166)

Basciano L C , Peterson R C , American Mineralogist , 93 (2008) p.853-862, Crystal chemistry of the natrojarosite-jarosite and natrojarosite-hydronium, jarosite solid-solution: A synthetic study with full Fe site occupancy, Locality: synthetic, Sample: R