maghemite
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Maghemite (Fe2O3, γ-Fe2O3) is a member of the family of iron oxides. It has the same formula as hematite, but the same spinel ferrite structure as magnetite () and is also ferrimagnetic. It is sometimes spelled as "maghaemite".
Key facts
- Mineral.name
- Maghemite
- Mineral.category
- Oxide minerals
- Mineral.image
- Maghemite - Mineralogisches Museum Bonn.jpg
- Mineral.imagesize
- 260px
- Mineral.formula
- γ-Fe2O3
- Mineral.IMAsymbol
- Mgh
- Mineral.strunz
- 4.BB.15
- Mineral.system
- Cubic with a tetragonal supercell
- Mineral.class
- Gyroidal (432) (same H-M symbol)
- Mineral.symmetry
- P4132, P4332
- Mineral.unit cell
- a = 8.33 Å; Z = 8 or a = 8.35 Å c = 24.99 Å; Z = 8 for tetragonal supercell
- Mineral.color
- Brown, bluish black; brown to yellow in transmitted light; white to bluish gray in reflected light.
- Mineral.habit
- Rarely as minute octahedral crystals, or acicular overgrowths; commonly as coatings on or replacements of magnetite; massive.
- Mineral.cleavage
- None
- Mineral.fracture
- Subconchoidal
- Mineral.mohs
- 5
- Mineral.luster
- Dull
- Mineral.streak
- Brown
via Wikipedia infobox
Wikidata facts
- Subclass of
- spinel supergroup
- Has part
- iron(III) oxide
- Named after
- hematite
- Image
- Maghemite - Mineralogisches Museum Bonn.jpg
Show 10 more facts
- Strunz 8th edition (series ID, updated)
- IV/C.04c
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 4.BB.15
- Commons category
- Maghemite
- chemical formula
- (Fe³⁺₀.₆₇☐₀.₃₃)Fe³⁺₂O₄
- Nickel-Strunz 9th edition (updated 2009)
- 4.BB.15
- type locality (geology)
- Bushveld igneous complex
- streak color
- brown
- crystal system
- cubic crystal system
- Mohs' hardness
- 6
- IMA Mineral Symbol
- Mgh
via Wikidata · CC0
~3 min read
Encyclopedic overview
6 sectionsContents
- Occurrence
- Cation distribution
- Electronic structure
- Applications
- As pollutant
- References
Maghemite (Fe2O3, γ-Fe2O3) is a member of the family of iron oxides. It has the same formula as hematite, but the same spinel ferrite structure as magnetite () and is also ferrimagnetic. It is sometimes spelled as "maghaemite".
Maghemite can be considered as an Fe(II)-deficient magnetite with formula \left(\ce{Fe^{III}8}\right)_A\left[\ce{Fe^{III}_{40/3}\square_{8/3}}\right]_B\ce{O32} where \square represents a vacancy, A indicates tetrahedral and B octahedral positioning.
Excerpted from Wikipedia’s “maghemite” article, available under the CC BY-SA 4.0 licence.