Samarium is a lustrous silver-white metal. It is one of the rare-earth metals of the lanthanide series in group IIIb of the periodic table . Naturally occurring samarium is a mixture of seven isotopes, three of which are radioactive with extremely long half-lives. The metal was not isolated in relatively pure form until recently, although it has long been used in pyrophoric alloys used in cigarette lighter flints.
Samarium is used as a catalyst in certain organic reactions.
The oxide, samaria, is used in special infrared absorbing glass and cores of carbon arc-lamp electrodes. Since one isotope of samarium is a good neutron absorber, the element has found use in nuclear reactor control rods. Samarium was discovered in 1879 by P. E. Lecoq de Boisbaudran by spectroscopic analysis of the mineral samarskite. Listing from Electric Library , a pay service. No relevant pictures or maps found.