Maghemite
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Maghemite 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". Wikipedia
Optical properties: Isotropic
Color: Brown, bluish black; brown to yellow in transmitted light; white to bluish gray in reflected light
Crystal class: Gyroidal (432); (same H-M symbol)
Crystal system: Cubic with a tetragonal supercell
Formula (repeating unit): γ-Fe2O3
Fracture: Subconchoidal
Luster: Dull