At present, ytterbium is mainly used as a dopant of stainless steel or active laser media, and less often as a gamma ray source.
en.wikipedia.org Mixtures of powdered ytterbium with polytetrafluoroethylene or hexachloroethane burn with a luminous emerald-green flame.
en.wikipedia.org Examples include gallium, ytterbium, bismuth, mercury and neptunium.
en.wikipedia.org While these compounds do exist, analogous chemicals that contain lanthanum, praseodymium, gadolinium, holmium, terbium, or ytterbium have not been discovered, as of 2008.
en.wikipedia.org The fluorescence of fluorite may be due to mineral impurities such as yttrium, ytterbium, or organic matter such as volatile hydrocarbons in the crystal lattice.
en.wikipedia.org