An ore of tantalum

• Heavy iron-black mineral
• A mineral consisting of tantalum oxide of iron and manganese that occurs with niobite or in coarse granite

WordNet Word definitions in WordNet
n. a mineral consisting of tantalum oxide of iron and manganese that occurs with niobite or in coarse granite; an ore of tantalum

Wiktionary Word definitions in Wiktionary
n. (context mineralogy English) A dark-brown mineral that is an ore of tantalum and niobium, of the chemical formula (iron, manganese) tantalum 2 oxygen 6 .

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Tantalite \Tan"ta*lite\, n. [Cf. F. tantalite.] (Min.) A heavy mineral of an iron-black color and submetallic luster. It is essentially a tantalate of iron.

Wikipedia Word definitions in Wikipedia
The mineral group tantalite [( Fe , Mn ) Ta O ] is the primary source of the chemical element tantalum . It is chemically similar to columbite , and the two are often grouped together as a semi-singular mineral called coltan or "columbite-tantalite" in ...