Definition

Noun: A valuable black mineral that is a solid solution series between columbite (iron, manganese niobate) and tantalite (iron, manganese tantalate). It is the primary ore for the metals niobium (columbium) and tantalum.

Usage

The term "columbite-tantalite" refers specifically to the mineral itself, which is mined and then processed to extract its constituent metals. * The region is rich in deposits of columbite-tantalite. * Geologists identified the black sand as columbite-tantalite.

Advanced Usage

• The mineral is almost universally known by its portmanteau name coltan, especially in industrial, geopolitical, and economic contexts.
• It is often discussed concerning "conflict minerals," as its mining in certain regions has been linked to armed conflict and human rights abuses.

Variants and Related Words

• Coltan (n): The common industrial and commercial name for columbite-tantalite ore.
  • The price of coltan fluctuates on the global market.
• Tantalite (n): The tantalum-rich end member of the columbite-tantalite series.
• Columbite (n): The niobium-rich end member of the columbite-tantalite series.

Synonyms

• Coltan (This is the typical synonym in common usage, not a scientific one).

Notes on Different Meanings

The term has one primary, specific meaning as a mineral. Its significance extends into fields like: * Economics/Technology: As a critical raw material for electronics. * Geopolitics: As a so-called "conflict mineral."

Related Phrases/Contexts

• Conflict mineral: A term often associated with columbite-tantalite (coltan) when sourced from regions experiencing armed conflict.
  • Companies are increasingly required to audit their supply chains for conflict minerals like coltan.
• Tantalum capacitor: A key electronic component made from tantalum extracted from columbite-tantalite.
  • The stability of tantalum capacitors makes them essential for mobile phones.

Noun

1. a valuable black mineral combining niobite and tantalite; used in cell phones and computer chips