Feroxyhyte
A valid IMA mineral species
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About Feroxyhyte
Formula:
Fe3+O(OH)
Colour:
Yellow-brown, brown
Specific Gravity:
4.20 (Calculated)
Crystal System:
Hexagonal
Name:
From the composition; (ferrum for iron, oxygen, and hydroxyl).
Polymorph of:
Compare vernadite.
Determination is likely exclusively based on a comparison (PXRD pattern and other physical properties) with synthetic material.
Determination is likely exclusively based on a comparison (PXRD pattern and other physical properties) with synthetic material.
Unique Identifiers
Mindat ID:
1484
Long-form identifier:
mindat:1:1:1484:3
Similar Names
IMA Classification of Feroxyhyte
Approved
Approval year:
1975
Classification of Feroxyhyte
4.FE.40
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
E : Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
E : Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
6.1.4.4
6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
1 : XO(OH)
6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
1 : XO(OH)
7.20.7
7 : Oxides and Hydroxides
20 : Oxides of Fe
7 : Oxides and Hydroxides
20 : Oxides of Fe
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Fox | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Feroxyhyte
Transparency:
Opaque
Colour:
Yellow-brown, brown
Streak:
Yellow
Comment:
not reported
Density:
4.20 g/cm3 (Calculated)
Optical Data of Feroxyhyte
Type:
Uniaxial
Chemistry of Feroxyhyte
Mindat Formula:
Fe3+O(OH)
Elements listed:
Crystallography of Feroxyhyte
Crystal System:
Hexagonal
Cell Parameters:
a = 2.93 Å, c = 4.60 Å
Ratio:
a:c = 1 : 1.57
Unit Cell V:
34.20 ų (Calculated from Unit Cell)
Z:
1
Comment:
Point Group: n.d.; Space Group: n.d
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Big Balls | Small Balls | Just Balls | Spacefill
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0016639 | Feroxyhyte | Patrat G, de Bergevin F, Pernet M, Joubert J (1983) Structure locale de delta-Fe O O H _cod_database_code 1008762 Acta Crystallographica B39 165-170 |  | 1983 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.54 Å | (10) |
| 2.23 Å | (5) |
| 1.69 Å | (3) |
| 1.47 Å | (8) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3b: Earth’s earliest hydrosphere | >4.45 |
| 17 : Marine authigenic Hadean minerals (see also #24) | |
| Near-surface Processes | |
| 24 : Authigenic minerals in terrestrial sediments (see also #17) | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 42 : Sea-floor Mn nodules | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47h : [Near-surface oxidized, dehydrated minerals] | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 48 : Soil leaching zone minerals | <0.6 |
Type Occurrence of Feroxyhyte
General Appearance of Type Material:
Minute, acicular, possibly comprising rolled thin plates; in aggregates with clayey particles.
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia.
Geological Setting of Type Material:
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 Fe2+-bearing compounds.
Associated Minerals at Type Locality:
Synonyms of Feroxyhyte
Other Language Names for Feroxyhyte
Varieties of Feroxyhyte
Common Associates
Associations Based on Photo Data:
| 4 photos of Feroxyhyte associated with Phosgenite | Pb2CO3Cl2 |
| 4 photos of Feroxyhyte associated with Goethite | Fe3+O(OH) |
| 1 photo of Feroxyhyte associated with Baryte | BaSO4 |
| 1 photo of Feroxyhyte associated with Ferrihydrite | Fe3+10O14(OH)2 |
| 1 photo of Feroxyhyte associated with Calcite | CaCO3 |
| 1 photo of Feroxyhyte associated with Aragonite | CaCO3 |
| 1 photo of Feroxyhyte associated with Cuprite | Cu2O |
| 1 photo of Feroxyhyte associated with Native Sulphur | S8 |
| 1 photo of Feroxyhyte associated with Nealite | Pb4Fe2+(As3+O3)2Cl4 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 4.FE. | Nannoniite | Al2(OH)5F |
| 4.FE.05 | Brucite | Mg(OH)2 |
| 4.FE.05 | Theophrastite | Ni(OH)2 |
| 4.FE.05 | Amakinite | Fe2+(OH)2 |
| 4.FE.05 | Portlandite | Ca(OH)2 |
| 4.FE.05 | Pyrochroite | Mn(OH)2 |
| 4.FE.10 | Doyleite | Al(OH)3 |
| 4.FE.10 | Bayerite | Al(OH)3 |
| 4.FE.10 | Nordstrandite | Al(OH)3 |
| 4.FE.10 | Gibbsite | Al(OH)3 |
| 4.FE.15 | Lepidocrocite | Fe3+O(OH) |
| 4.FE.15 | Böhmite | AlO(OH) |
| 4.FE.20 | Heterogenite | Co3+O(OH) |
| 4.FE.20 | Grimaldiite | CrO(OH) |
| 4.FE.25 | Lithiophorite | (Al,Li)MnO2(OH)2 |
| 4.FE.25 | Feitknechtite | Mn3+O(OH) |
| 4.FE.30 | Quenselite | PbMnO2(OH) |
| 4.FE.35 | Ferrihydrite | Fe3+10O14(OH)2 |
| 4.FE.40 | Vernadite | (Mn4+,Fe3+,Ca,Na)(O,OH)2 · nH2O |
| 4.FE.45 | Quetzalcoatlite | Zn6Cu3(TeO6)2(OH)6 · AgxPbyClx+2y |
| 4.FE.50 | Fuettererite | Pb3Cu2+6Te6+O6(OH)7Cl5 |
Other Information
Notes:
oxidizes in air to give goethite
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Feroxyhyte
mindat.org URL:
https://www.mindat.org/min-1484.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Feroxyhyte
Localities for Feroxyhyte
Showing 36 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Arctic Ocean | |
| Murdmaa et al. (2000) | |
| Pekov (1998) | |
Atlantic Ocean | |
| Varentsov et al. (2009, April) | |
| Bogdanov et al. (2008) |
| Bogdanov et al. (2008) | |
| Bogdanov et al. (2008) |
| Bogdanov et al. (2008) | |
Germany | |
| Walenta (1997) +1 other reference |
Greece | |
| www.rogersminerals.com (n.d.) |
| Gelaude et al. (1996) | |
| 50. +1 other reference |
| Gelaude et al. (1996) |
| Gelaude et al. (1996) | |
Indian Ocean | |
| Maciąg et al. (2019) | |
Italy | |
| Bonotti et al. (2012) |
| Muenchener Micromounter-Lithothek |
Japan | |
| Nambu & Yoshida (1997) |
Nazca Plate | |
| Zawadzki et al. (2022) | |
Pacific Ocean | |
| Wegorzewski et al. (2014) |
| Novikov et al. (2006) |
| Peretyazhko et al. (2025) |
| [var: Manganese-bearing feroxytyte] Novikov et al. (2023) +1 other reference | |
| Yang et al. (2024) | |
| Glasby et al. (2006) |
Poland | |
| Dulski et al. (2025) |
Russia | |
| Filimonova et al. (2010) |
| Novgorodova et al. (1995) +1 other reference |
| Glasby et al. (2006) |
South Africa | |
| SAMS (South African Micromount Society) |
Switzerland | |
| Marco Bonifazi |
UK | |
| BMS Newsletter 79 (http://britishmicromountsociety.homestead.com/Gannell-Smelter.html) |
| Norman Wilson collection |
Ukraine | |
| Chukhrov F.V. et al. (1987) |
| Pekov (1998) |
Quick NavTopAbout FeroxyhyteUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesVarietiesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Vrysaki Point slag locality, Velatouri, Lavreotiki, East Attica, Attica, Greece