ixiolite

Etymology
From the Greek mythical character Ixion,. This mineral contains tantalum, named after Tantalus, who is another Greek mythical figure with whom Ixion had a similarity in that they both are punished in Tartarus.

Noun

 * 1)  A monoclinic-prismatic mineral containing iron, manganese, niobium, oxygen, tantalum, and tin.