D defs.my
Entry 1 sense Webster, 1913

Yttro-columbite

· Yt·tro-co·lum·bite · IPA
01 n. A tantalate of uranium, yttrium, and calcium, of a brown or black color.
  1. 1.
    A tantalate of uranium, yttrium, and calcium, of a brown or black color.(Min.)