Samarskite definitions

sə-mär'skīt', săm'ər-
A velvet-black mineral that is a complex mixture of several rare-earth metals with niobium and tantalum oxide.
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A dark-colored, hard, radioactive, mineral, (Y,Ce,U,Ca,Fe,Pb,Th)(Nb,Ta,Ti,Sn)2O6, that is an ore of uranium or niobium.
noun
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(mineralogy) A shiny black radioactive mineral that contains a complex mixture of rare earth oxides.
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Origin of samarskite

After Col. M. von Samarski , 19th-century Russian mining official