·noun A tantalate of uranium, yttrium, and calcium, of a brown or black color.
·noun A heavy mineral of an iron-black color and submetallic luster. It is essentially a tantalate o...
Webster's Dictionary of the English Language
·noun A mineral of a violet-blue color, inclining to gray and white. It is a hydrous fluoride of cer...
·noun ·Alt. of Yttro-tantalite. ...