Szomolnokite
A variety of Minerals

What is Szomolnokite?
Szomolnokite (FeSO4·H2O) is a monoclinic iron sulfate mineral forming a complete solid solution with magnesium end-member kieserite (MgSO4·H2O). 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.
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Szomolnokite Localities Map
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Quick Facts
Physical Properties
- Color
- Pale yellow or reddish-brown, may also be light blue, very pale greenish white to white, rarely pink due to cobalt
- Hardness (Mohs)
- 2.5
- Density
- 3.1 g/cm³
- Streak
- Not reported.
Chemical Properties
- Chemical Formula
- FeSO4 · H2O
- Elements
- Fe, H, O, S

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