Samarskite
Pronunciation : Sa*mar"skite
Part of Speech : a.
Etymology : [After Samarski, a Russian.] (Min.)
Definition : Defn: A rare mineral having a velvet-black color and submetallic luster. It is a niobate of uranium, iron, and the yttrium and cerium metals.
Source : Webster's Unabridged Dictionary, 1913