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

Derived forms: coltans

Type of: mineral

Encyclopedia: Coltan

• Gregorian calendar
• Gregorian calendar month
• Gregorian chant
• Gregorian mode
• Gregorian telescope
• Gregory
• Gregory Goodwin Pincus
• Gregory I
• Gregory John Norman
• Gregory Nazianzen
• Gregory of Nazianzen
• Gregory Pincus
• Gregory the Great
• Gregory VII
• Gregory XII
• Gregory XIII
• Gregory XVI
• greisen
• gremlin
• Grenada
• Grenada dollar
• grenade
• grenade thrower
• Grenadian
• grenadier