Mineral phase
- IMA name
- Maghemite
- Secondary names
- gamma-Fe2O3
- Class
- non-silicate mineral
- Compound type
- oxide-hydroxide
- Formula
- $Fe^{3+}(Fe^{3+}_{1.67},[]_{0.33})O_4$
- Chemical formula
- gamma-(Fe3+)2O3
- Elemental formula
- Fe2.67 O4
- Isotope mixture type
- terrestrial abundance
- Oxides
-
Formula $Fe_{2}O_{3}$ Mass fraction (%) 100.0
Strunz
- Class
- oxides - hydroxides - arsenites (04)
- Division
- metal:oxygen = 3:4 and similar (04.B)
- Family
- with only medium-sized cations (04.BB)
- Code
- 04.BB.15
Dana
- Major class
- oxides and hydroxides (III)
- Class
- simple oxides (04)
- Type
- with a cation charge of 3+ (A+++2O3) (04.03)
- Group
- -Maghemite- group (04.03.07)
- Code
- 04.03.07.01
- Phase name
- gamma-Fe2O3
- Phase type
- crystalline
- Crystal system
- isometric (cubic)
- Crystal class
- gyroidal
- Crystal class symbol
- 432 (O)
- Crystal spacegroup
- P4(1)32
- Crystal sites
-
Label Nb Type Wp Specie Specie coordinence Specie occupancy Specie oxidation state Fe1 1 main $Fe^{3+}$ tetrahedral IV 1.0 3 Fe2 2 main $Fe^{3+}$ octahedral VI 0.833 3 - Composition order
- ordered
- Comments
- also group $P4_332$
- Molar mass
- 260.885 $g/mol$
- Density
- 4.86 (calc.) $g/cm^3$
- State NTP
- solid
- Refringence type
- isotropic
- Refringence sign
- no
- Birefringence
- 0
- Pure color
- brown
- Color
- dark brown
- Diaphaneity
- opaque
- Luster
- metallic