👉 Uranotantalite is a mineral that belongs to the group of minerals called pyroxene. It is commonly found in rocks and metamorphic igneous bodies, particularly in the tectonic plates. The chemical formula for uranium nitrate (U(NO3)2) is U + 4NO3 - 2. Uranotantalite is a silicate mineral that is formed when iron oxides are exposed to ultraviolet light. It has a white, lustrous appearance