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|Crystal class||Prismatic (2/m) |
(same H-M symbol)
|Unit cell||a = 10.561, b = 3.031 |
c = 10.483 [Å]; β = 90.63°; Z = 1
|Color||Yellowish brown, rusty brown|
Akaganeite is often described as the β phase of anhydrous ferric oxyhydroxide FeOOH, but some chloride (or fluoride) ions are normally included in the structure,, so a more accurate formula is FeO
0.167.Nickel may substitute for iron, yielding the more general formula (Fe3+
Akaganeite has a metallic luster and a brownish yellow streak. Its crystal structure is monoclinic and similar to that of hollandite BaMn
16, characterised by the presence of tunnels parallel to the c-axis of the tetragonal lattice. These tunnels are partially occupied by chloride anions that give to the crystal its structural stability.
Akaganeite has also been found in widely dispersed locations around the world and in rocks from the Moon that were brought back during the Apollo Project. The occurrences in meteorites and the lunar sample are thought to have been produced by interaction with Earth's atmosphere. It has been detected on Mars through orbital imaging spectroscopy.
- Ernst A.J. Burke (2008): "Tidying up Mineral Names: an IMA-CNMNC Scheme for Suffixes, Hyphens and Diacritical marks". Mineralogical Record, volume 39, issue 2.
- Jongsik Kim and Clare P. Grey (2010), "Li Solid-State MAS NMR Study of Local Environments and Lithium Adsorption on the Iron(III) Oxyhydroxide, Akaganeite (β-FeOOH)". Chemistry of Materials, volume 22, pages 5453–5462. doi:10.1021/cm100816h
- C. Rémazeilles and Ph. Refait (2007): "On the formation of β-FeOOH (akaganéite) in chloride-containing environments". Corrosion Science, volume 49, issue 2, pages 844-857. doi:10.1016/j.corsci.2006.06.003
- "Mineral 314-687: Akaganeite". Mindat.org database, accessed on 2019-02-12.
- Matsuo Nambu (1968): "岩手県赤金鉱山産新鉱物赤金鉱 (β-FeOOH) について (New mineral Akaganeite, β-FeOOH, from Akagane Mine, Iwate Prefecture, Japan)", Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists, volume 59, issue 4, pages 143-151,doi:10.2465/ganko1941.59.143
- Alan Lindsay Mackay (1962): "β-ferric oxyhydroxide - akaganéite", in Mineralogical Magazine and Journal of the Mineralogical Society, volume 33, issue 259, pages 270-280. doi:10.1180/minmag.1962.033.259.02 Cites a private communication by Matsuo Nambu (1961). Note: the diacritic in the title is incorrect, see Burke (2008). Reviewed by Mandarino (1963) in American Minralogist
- J. A. Mandarino (1963): "New Mineral Names: Akaganéite". American Mineralogist, volume 48, issues 5-6, page 711. Short review of Mackay's communication (1962) in Mineralogical Magazine. Note: the diacritic in the title is incorrect.
- Carter et al. 2015 "Orbital detection and implications of akaganéite on Mars" Icarus, 253: 296-310
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