Wolframite
others
Silicate
Silica and rare-earth silicates; Silicon carbide
Rutile
Titania
Hexaferrite
M-type magnetoplumbite
Spinel and olivine
Spinel, gamma-alumina, and magnetite
Perovskite and rocksalt
YIP, YAP, and Ruddlesden-Poppers
Garnet
YAG, and YIG
Fluorite and pyrochlore
Hafnia, zirconia, yttria, and lutetia
Corundum
Alumina, ruby, and hematite