| Feroxyhyte | |
|---|---|
 Image of Feroxyhyte | |
| General | |
| Category | Oxide mineral |
| Formula | δ-Fe3+O(OH) |
| IMA symbol | Fox1 |
| Strunz classification | 4.FE.40 |
| Dana classification | 06.01.04.04 |
| Crystal system | Hexagonal Unknown space group |
| Unit cell | a = 2.95, c = 4.56 [Å]; z = 1 |
| Identification | |
| Formula mass | 88.85 g/mol |
| Color | Brown, yellow-brown |
| Crystal habit | Concretionary, massive, nodular |
| Streak | Yellow |
| Diaphaneity | Opaque |
| Specific gravity | 4.31 |
| Density | 4.2 |
| Optical properties | Uniaxial |
| References | 234 |
Feroxyhyte is an oxide/hydroxide of iron, δ-Fe3+O(OH). Feroxyhyte crystallizes in the hexagonal system. Feroxyhyte forms as brown, rounded to concretionary masses. Feroxyhyte is an opaque, magnetic mineral with a yellow streak and a relative density of 4.2.3
It occurs in manganese-iron nodules on the Atlantic and Pacific Ocean floors. It is also found in the Baltic, White, and Kara Seas.5 Forms under high pressure conditions and reverts to goethite on exposure to surface conditions.3 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.5
It was first described in 1976 for an occurrence in soils at its type locality: Kolomyya, Ivano-Frankivsk Oblast, Ukraine.25
References
References
- Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- "Feroxyhyte mineral information and data". Mindat.org. Retrieved 2011-10-24.
- "Feroxyhyte mineral data". Webmineral.com. Retrieved 2011-10-24.
- "Information card – Feroxyhyte". Mineral Crystal Structure Database. Archived from the original on 2019-03-13. Retrieved 2011-10-24.
- "Handbook of Mineralogy" (PDF). Archived from the original (PDF) on 2021-02-27. Retrieved 2011-10-24.