9 letters · 15 points in Scrabble
noun a black mineral that is an ore of niobium and tantalum
originEtymology tree English columbium Proto-Indo-European *-tósder. Ancient Greek -της (-tēs)der. Ancient Greek -ῑ́της (-ī́tēs)der. Latin -ītēsbor. French -iteder. English -ite English columbite From columbium (“niobium”) + -ite.
Etymology from Wiktionary, CC BY-SA 3.0