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|Name:||From the first syllables of MAGnetite and HEMatite, in allusion to the magnetism and composition.|
A ferromagnetic iron oxide (which may therefore be confused with magnetite).
Maghemite is formed by weathering or low-temperature oxidation of spinels containing ferrous iron, commonly magnetite or titanian magnetite. It is a widespread yellow pigment in continental sediments, rocks, and soils.
Classification of Maghemite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||4/C.06-10|
|Nickel-Strunz 10th (pending) edition ID:||4.BB.15|
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations
|Dana 8th edition ID:||18.104.22.168|
4 : SIMPLE OXIDES
3 : A2X3
|Hey's CIM Ref.:||7.20.3|
7 : Oxides and Hydroxides
20 : Oxides of Fe
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Type Occurrence of Maghemite
|Type Locality:||Bushveld Complex, South Africa|
|Year of Discovery:||1927|
Physical Properties of Maghemite
Crystallography of Maghemite
|Class (H-M):||4 3 2 - Gyroidal|
|Space Group:||P41 3 2|
|Cell Parameters:||a = 8.3515Å|
|Unit Cell Volume:||V 582.50 Å³ (Calculated from Unit Cell)|
|Morphology:||Commonly as coatings on or replacements of magnetite; massive; rarely as minute octahedral crystals, or acicular overgrowths.|
|Comment:||Cubic (P4132 or P4332), typically with a tetragonal supercell (P41 or P43, a = 8.35, c = 24.99 A).).|
|X-Ray Powder Diffraction:|
Optical Data of Maghemite
|Colour in reflected light:||White to greyish blue|
Chemical Properties of Maghemite
|Simplified for copy/paste:||Fe3+2O3|
|Essential elements:||Fe, O|
|All elements listed in formula:||Fe, O|
Relationship of Maghemite to other Species
|Series:||Forms a series with Magnetite (see here)|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Maghemite
|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 Maghemite
Sosman and Posnjak (1925) Washington Academy of Science, Journal: 15: 329.
Wagner (1927) Economic Geology: 22: 845.
Schneiderhöhn and Ramdohr (1931) 2: 537.
Winchell (1931) American Mineralogist: 16: 270 (as oxymagnite).
Palache, Charles, Harry Berman & Clifford Frondel (1944) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 708-709.
Contributions to Mineralogy and Petrology (1979) 69: 249.
Internet Links for Maghemite
Localities for Maghemite
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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Locality Updated: Wright Quarry, Stony Run, Baltimore City, Maryland, USAFrom STUART HERRING, 22nd Aug 2014 08:27:40