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.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Szomolnokite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
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
- Rock tumbling
- Not recommended
- Density
- 3.1 g/cm³
- Streak
- Not reported.
Chemical Properties
- Chemical Formula
- FeSO4 · H2O
- Elements
- Fe, H, O, S
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Szomolnokite FAQs
How do I identify Szomolnokite?
Szomolnokite can be identified by its hardness of 2.5 on the Mohs scale, Pale yellow or reddish-brown color. Look for these key characteristics when examining specimens.
What color is Szomolnokite?
Szomolnokite typically appears in Pale yellow or reddish-brown, may also be light blue, very pale greenish white to white, rarely pink due to cobalt. Color can vary depending on impurities and formation conditions.
How hard is Szomolnokite?
Szomolnokite has a hardness of 2.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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