Yttro-tantalite

from The Collaborative International Dictionary of English v.0.48

Yttro-columbite \Yt`tro-co*lum"bite\, Yttro-tantalite
\Yt`tro-tan"ta*lite\, n. (Min.)
   A tantalate of uranium, yttrium, and calcium, of a brown or
   black color.
   [1913 Webster]