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Name Erbium
Symbol Er
Atomic number 68
Atomic mass 167.259 amu
Normal state Solid
Classification Metallic
Crystal structure Hexagonal
Color grayish-silver, tarnishes when exposed to air
Date of discovery 1842
Name of discoverer Carl Gustaf Mosander
Name origin Named for Ytterby, Sweden
Uses Erbium oxide is used in ceramics to obtain a pink glaze. Also used to make infrared-absorbing glass and in alloys with titanium.
Obtained from Found with other heavier rare earths.