Further heating leads to a transition to a body-centered cubic (bcc) phase. Heating changes the crystal structure to hexagonal close-packed (hcp). Under ordinary conditions, the metal has rhombohedral crystals.It tarnishes in air and will ignite in air at about 150 ☌. It is the hardest and the most brittle of the rare earth elements. Samarium is a yellowish silver-colored metal.Samarskite gets its name from its discoverer and the man who loaned Boisbaudran the mineral samples for his study - Russian mining engineer V.E. It was discovered in 1879 by French chemist Paul Émile Lecoq de Boisbaudran after he added ammonium hydroxide to the preparation made from the mineral samarskite. Samarium was the first element to be named in honor of a person (an element eponym).
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