Where it forms, where it's found
- Geological setting
Sea-floor Fe–Mn concretions; cement and coatings on clasts in poorly drained soils and sediments of a Eh-low (reduced) character; results from rapid oxidation of Fe<sup>2+</sup>-bearing compounds.
- Type locality
- Kolomyia (Kolomyya
- Kolomea)
- Ivano-Frankivsk Oblast
- Ukraine
27recorded occurrences
Physical
- Transparency
- Opaque
- Colour
- Yellow-brown · brown
- Streak
- Yellow
- Density
- 4.20 g/cm³
Optical
- Optical type
- Uniaxial
Crystallography
- Cell parameters
- a = 2.93 Å · c = 4.60 Å
- Z
- 1
- Type-locality form
Minute, acicular, possibly comprising rolled thin plates; in aggregates with clayey particles.
- Comment
Point Group: n.d.; Space Group: n.d
Crystal structure
Chemical composition
Synonyms
- Feroxygit
- Feroxygita
- Feroxygite
- Feroxyhit
- IMA1975-032
In other languages
- French
- Feroxyhyte
- German
- Feroxyhyt · IMA 1975-032
- Spanish
- Feroxihita
- Italian
- Feroxyhyte
Classification
Strunz
10th ed.4.FE.40
- 4OxidesClass
- 4.FHydroxides (without V or U)Division
- 4.FEHydroxides with OH, without H2O; sheets of edge-sharing octahedraGroup
- 4.FE.40FeroxyhyteSpecies
Dana
8th ed.06.01.04.04
- 06Hydroxides and Oxides Containing HydroxylClass
- 06.01XO(OH)Type
- 06.01.04Heterogenite GroupGroup
- 06.01.04.04FeroxyhyteSpecies
CIM
—7.20.7
- 7Oxides and HydroxidesClass
- 7.20Oxides of FeGroup
- 7.20.7FeroxyhyteSpecies
Group, growth & confusion
Literature, links & citation
Citations
- 1976Chukhrov, F.V., Zvyagin, B.B., Gorshkov, A.I., Ermilova, L.P., Korovushkin, V.V., Rudnitskaya, E.S., Yakubovskaya, N.Y. (1976) Feroxyhyte, a new modification of FeO(OH). Izvest. Akad. Nauk SSR, Ser. geol., 5, 5-24 (in Russian).
- 1977Fleischer, Michael, Pabst, Adolf, Mandarino, J. A., Chao, George Y. (1977) New mineral names. American Mineralogist, 62 (9-10) 1057-1061
- 2005(2005) Feroxyhyte. Handbook of Mineralogy. Mineralogical Society of America
- 2016Anthony, John W., Bideaux, Richard A., Bladh, Kenneth W., Nichols, Monte C. - Eds. (2016) Handbook of Mineralogy. https://www.handbookofmineralogy.org/
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Feroxyhyte — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/feroxyhyte-1484},
note = {Accessed 2026-05-11}
}