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Prasedynium (Pr), europium (Eu) and gadolium (Gd) are used in the display colours of mobile phones. Terbium (Tb), dysprosium (Dy), erbium (Er), thulium (Tm), ytterbium (Yb) and lutetium (Lu) are used in mobile phone batteries. These Real Earth Elements are all found in monazite.
This mineral is currently in storage at the National Museums Collection Centre.