( n. )
A rare mineral of resinous luster and high specific gravity. It is a tantalate of calcium, and occurs in octahedral crystals usually very minute.
( n. )
A rare mineral of resinous luster and high specific gravity. It is a tantalate of calcium, and occurs in octahedral crystals usually very minute.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012