Encyclopedia > Niobite

Article Content

Niobite

Niobite, also called columbate and columbite (Fe, Mn)(Nb, Ta)₂)O₆]) is a black mineral that is an ore of niobium and tantalum. It has a submetallic luster and a high specific gravity and is a niobate of iron and manganese, containing tantalate of iron. This mineral was first found in New England.

Featured Article

Grateful Dead

... "The Vault" starting with View From the Vault (recorded in Pittsburgh on July 8, 1990 at Three Rivers Stadium[?]) and Another View from the Vault (recorded in Washington, ...