Holmium glass filter

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rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 … Universalium
Cerium — lanthanum ← cerium → praseodymium ↑ Ce ↓ Th … Wikipedia
Neodymium — praseodymium ← neodymium → promethium ↑ Nd ↓ U … Wikipedia
Erbium — (pronEng|ˈɝbiəm) is a chemical element with the symbol Er and atomic number 68. A rare, silvery, white metallic lanthanide, erbium is a solid in its normal state. It is a rare earth element associated with several other rare elements in the… … Wikipedia
Indium — Not to be confused with Iridium. cadmium ← indium → tin Ga ↑ In ↓ Tl … Wikipedia
Titanium — This article is about the chemical element. For other uses, see Titanium (disambiguation). scandium ← titanium → vanadium … Wikipedia

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