The metal has a bright silvery metallic luster, Neodymium is one of the more reactive rare-earth metals and quickly tarnishes in air, forming an oxide that spalls off and exposes metal to oxidation. The metal, therefore, should be kept under light mineral oil or sealed in a plastic material.
Melting point: 1021 °C Boiling point: 3074 °C
A foil is a thin sheet of pure metal. Given its fragile nature, some foils have protective coatings.