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|System:||Monoclinic||Colour:||Yellowish brown, rusty ...|
|Name:||Named after its discovery locality|
Note: The spelling akaganéite is incorrect (Burke, 2008).
Classification of Akaganeite
|IMA status:||Approved 1962|
|Strunz 8th edition ID:||4/F.06-50|
|Nickel-Strunz 10th (pending) edition ID:||4.DK.05|
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
K : With large (+- medium-sized) cations; tunnel structures
|Dana 8th edition ID:||220.127.116.11|
6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
1 : XO(OH)
|Hey's CIM Ref.:||7.20.6|
7 : Oxides and Hydroxides
20 : Oxides of Fe
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Type Occurrence of Akaganeite
|Type Locality:||Akagane mine, Esashi City, Iwate Prefecture, Tohoku Region, Honshu Island, Japan|
|General Appearance of Type Material:||fine-grained to powdery masses, consisting of bundles of tiny spindlelike crystals up to 5 µm in length|
|Geological Setting of type material:||oxidation zone of a pyrrhotite-bearing iron sulphide deposit, apparently formed from pyrrhotite by ferric-sulphate-bearing solutions|
|Associated Minerals at type locality:|
Occurrences of Akaganeite
|Geological Setting:||in oxidation zones of pyrrhotite-bearing iron sulphide deposits, as an important constituent of some soils, in certain geothermal brines and in sea-floor nodules, also formed as corrosion product of some meteorites|
Physical Properties of Akaganeite
|Diaphaneity (Transparency):||Transparent, Translucent|
|Colour:||Yellowish brown, rusty brown|
|Density (calculated):||3.52 g/cm3|
Crystallography of Akaganeite
|Class (H-M):||2/m - Prismatic|
|Cell Parameters:||a = 10.561Å, b = 3.031Å, c = 10.483Å|
β = 90.63°
|Ratio:||a:b:c = 3.484 : 1 : 3.459|
|Unit Cell Volume:||V 335.54 Å³ (Calculated from Unit Cell)|
|X-Ray Powder Diffraction:|
|Comments:||Pattern of synthetic β-FeO(OH)|
Optical Data of Akaganeite
|Dispersion:||r > v strong|
Chemical Properties of Akaganeite
|Simplified for copy/paste:||β-Fe3+O(OH,Cl)|
|Essential elements:||Fe, H, O|
|All elements listed in formula:||Cl, Fe, H, O|
|Analytical Data:||Sample from Akagané Mine, Japan|
Other samples from the locality contain significant Cl; Si and Al are probably impurities
SiO2 (3.10) AlsO3 (1.21) Fe2O3 (78.23) FeO (0.82) Na2O (0.62) K2O (0.19) H2O (15.16) sum 99.33 wt.-%
Relationship of Akaganeite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Akaganeite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Akaganeite
Mackay, A. L. (1962): β-ferric ohyhydroxide - akaganéite. Mineralogical Magazine 33, 270-280. - American Mineralogist (1963), 48, 711 (abstract).
American Mineralogist (1971), 56, 659.
Murad, E. (1979): Mössbauer and X-ray data on β-FeOOH (akaganéite). Clay Minerals 14, 273-284.
Buchwald, V. F. and Clarke, R. S., Jr. (1989): Corrosion of Fe-Ni alloys by Cl-containing akaganéite (β-FeOOH): the Antarctic meteorite case. American Mineralogist 74, 656-667.
Post, J. E. and Buchwald, V. F. (1991): Crystal structure refinement of akaganéite. American Mineralogist 76, 272-277.
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 7.
Burke, E. A. J. (2008): Tidying up Mineral Names: An IMA scheme for Suffixes, Hyphens and Diacritical Marks. Mineralogical Record, 39, 131-135.
Internet Links for Akaganeite
Localities for Akaganeite
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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New Locality Added: Gaiteiros Mine, Arcos, Tabuaço, Viseu District, PortugalFrom Rui Nunes, 24th Oct 2014 10:25:12