Erbium

From Conservapedia

Erbium
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.