Siderotil
A variety of Minerals
What is Siderotil?
Siderotil is an iron(II) sulfate hydrate mineral with formula: FeSO4·5H2O which forms by the dehydration of melanterite. Copper commonly occurs substituting for iron in the structure. It typically occurs as fibrous or powdery encrustations, but may also occur as acicular triclinic crystals. It was first described in 1891 for an occurrence in the Idrija Mine, Idrija, Slovenia. Its name derives from the Greek sideros (iron) and tilos (fiber) in reference to its iron content and typical fibrous form. However, the material at the Idrija location may not be siderotil, but the mineral has been authenticated from a wide variety of worldwide locations.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Siderotil 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.
Siderotil Localities Map
See where Siderotil is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Yellowish, white, light green; colourless in transmitted light.
- Hardness (Mohs)
- 2.5
- Streak
- White
Chemical Properties
- Chemical Formula
- FeSO4 · 5H2O
- Elements
- Fe, H, O, S
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Siderotil FAQs
How do I identify Siderotil?
Siderotil can be identified by its hardness of 2.5 on the Mohs scale, Yellowish color. Look for these key characteristics when examining specimens.
What color is Siderotil?
Siderotil typically appears in Yellowish, white, light green; colourless in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Siderotil?
Siderotil 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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