Feroxyhyte
A variety of Minerals
What is Feroxyhyte?
Feroxyhyte is an oxide/hydroxide of iron, δ-FeO(OH). Feroxyhyte crystallizes in the hexagonal system. It forms as brown rounded to concretionary masses. Feroxyhyte is opaque, magnetic, has a yellow streak, and has a relative density of 4.2. It occurs in manganese-iron nodules on the Atlantic and Pacific Ocean floors. It is also found in the Baltic, White, and Kara Seas. Forms under high pressure conditions and reverts to goethite on exposure to surface conditions. It also occurs as cement and coatings on clasts in poorly drained soils and sediments, formed by the rapid oxidation of iron(II) oxide compounds. It was first described in 1976 for an occurrence in soils at its type locality: Kolomyya, Ivano-Frankivsk Oblast, Ukraine.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Feroxyhyte 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.
Feroxyhyte Localities Map
See where Feroxyhyte is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- yellow-brown, brown
- Density
- 4.2 g/cm³
- Streak
- yellow
Chemical Properties
- Chemical Formula
- Fe3+O(OH)
- Elements
- Fe, H, O
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Feroxyhyte FAQs
How do I identify Feroxyhyte?
Feroxyhyte can be identified by its yellow-brown color. Look for these key characteristics when examining specimens.
What color is Feroxyhyte?
Feroxyhyte typically appears in yellow-brown, brown. Color can vary depending on impurities and formation conditions.
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