title: Szomolnokite
text: # Szomolnokite
  
  Szomolnokite $(Fe^{2+}SO_4·H_2O)$ is a monoclinic iron sulfate mineral forming a complete solid solution with magnesium end-member kieserite $(MgSO_4·H_2O).$ In 1877 szomolnokite's name was derived by Joseph Krenner from its type locality of oxidized sulfide ore containing iron in Szomolnok, Slovakia (Hungary at the time).
  
  As of mid-January 2020 the only continent on which szomolnokite has not been found and reported is Antarctica.
  
  At room temperature szomolnokite is stable up to a pressure of 6.2 GPa, and then transforms into triclinic crystal structure.
  
  