Question

The mineral columbite, an important source of niobium and tantalum, is typically found in which type of rock ?

• A. Komatiite
• B. Carbonatite
• C. Andesite
• D. Trachyte

Answer 1

Answer:

B. Carbonatite

• Alkalic Host Environment: Columbite, along with other niobium and tantalum-bearing minerals, primarily concentrates in highly evolved, alkalic, or silica-undersaturated igneous systems.

• Carbonatites: These are unique igneous rocks composed of greater than 50% carbonate minerals. They are famously recognized as a major primary genetic environment and primary economic source for rare-earth elements, niobium, and tantalum minerals (such as columbite and pyrochlore).