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Samarium

Description: Samarium has a gleaming silver luster and is fairly stable in air. The metal has three crystal modifications, with transformations at 734 and 922°C. At about 150°C, the metal ignites in air. The sulfide has good thermoelectric efficiencies and excellent high-temperature stability up to 1100°C.

Source: Samarium can be found along with other rare-earth elements in many minerals, including monazite and bastnasite, which are commercial sources. It occurs in monazite at a rate of 2.8%.
The oxide can be reduced with lanthanum to produce samarium metal.