The Eroica is a true audiophile moving coil cartridge which features an advanced pole shoe design using a powerful rare earth Neodymium magnet.
The mantle in an Aladdin lamp is made from a unique mixture of rare earth oxides.
Cleve proposed to divide the " rare earth " metals into two groups, (1) " perfectly characterized "; (2) " not yet thoroughly characterized."
In the separation of the constituents of the complex mixture of oxides obtained from the " rare earth " minerals, the methods generally forced upon chemists are those of fractional precipitation or crystallization; the striking resemblances of the compounds of these elements rarely admitting of a complete separation by simple precipitation and filtration.
These crude earths, yttria and ceria, have supplied most if not all of the " rare earth " metals.