Neodymium iron boron magnet
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Neodymium iron boron magnets, commonly referred to as neodymium magnets or NdFeB, NIB or Neo magnet, are magnets made from a sintered alloy of neodymium, iron, and boron. They produce the highest commercially available magnetic fields (approximately 1 tesla) and make paramagnetism and diamagnetism in materials far more visible than most other magnets. They are also a common source of neodymium because they are relatively easy to obtain from different everyday objects. Due to their high field strengths large neodymium magnets may cause damage to objects if they are allowed near ferromagnetic materials, and can break bones easily.
NdFeB magnets are not very resistant to moisture and corrosive vapors over time, which is why they tend to be nickel-plated.
Almost all rare-earth permanent magnets are made of this material.
Extracting neodymium from magnets
Is difficult for the home chemist. Witness the epic that is The trouble with Neodymium thread.
In closed containers, away from moisture and acidic vapors.
Best to recycle it.