Mineral Factbook

Maghemite

(Fe3+0.67܆0.33)Fe3+2O4IMA symbol: Mghredefined

Maghemite is an oxide or hydroxide mineral with the formula (Fe3+0.67܆0.33)Fe3+2O4, crystallizing in the cubic system. It has a Mohs hardness of 6, a calculated density of 4.851 g/cm3. Its streak is brown.

Photos

Maghemite specimen photo
David alterman · CC BY-SA 4.0 · Commons
Maghemite specimen photo
David alterman · CC BY-SA 4.0 · Commons
Maghemite specimen photo
Ra'ike · CC BY-SA 3.0 · Commons
Maghemite specimen photo
Galuskin, Evgeny V., Hannes Krüger, Irina O. Galuskina, Biljana Krüger, Krzysztof Nejbert, and Yevgeny Vapnik. · CC BY 4.0 · Commons

Crystallography

Crystal systemcubic crystal systemWikidata (CC0)
Space groupP 43 3 2
Cell (Å, °)a = 8.3364, b = 8.3364, c = 8.3364; α = 90, β = 90, γ = 90
Cell volume579.343 ų, Z = 8
Axial ratios1.0000:1:1.0000calculated from COD 9017493
Source structureCOD 9017493 (Journal of Applied Crystallography, 2014) — 1 of 10 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)2.5141.4742.9471.6042.0841.702
I/I₀10044.934.431.817.412.2

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9017493; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)4.851 g/cm³calculated from COD 9017493
Hardness (Mohs)
6single sourceWikidata (CC0)
Streak
brownsingle sourceWikidata (CC0)

Classification

Nickel-Strunz (10th)4.BB.15Wikidata (CC0)
Nickel-Strunz (9th)4.BB.15Wikidata (CC0)